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Finding the Fourth Proportional to 386,887.40, 580,331.10 and 220,999.40

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Solution

The fourth proportional to 386,887.40, 580,331.10 and 220,999.40 is: 331,499.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,887.40 : 580,331.10 = 220,999.40 : x
  2. Step 2: Convert to fraction form
    386,887.40/580,331.10 = 220,999.40/x
  3. Step 3: Cross multiply
    386,887.40x = 580,331.10 × 220,999.40
  4. Step 4: Simplify right side
    386,887.40x = 128,252,824,901.34
  5. Step 5: Solve for x
    x = 128,252,824,901.34/386,887.40
  6. Step 6: Final answer
    x = 331,499.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.