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Finding the Fourth Proportional to 611,999.40, 917,999.10 and 425,375.40

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Solution

The fourth proportional to 611,999.40, 917,999.10 and 425,375.40 is: 638,063.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,999.40 : 917,999.10 = 425,375.40 : x
  2. Step 2: Convert to fraction form
    611,999.40/917,999.10 = 425,375.40/x
  3. Step 3: Cross multiply
    611,999.40x = 917,999.10 × 425,375.40
  4. Step 4: Simplify right side
    611,999.40x = 390,494,234,362.14
  5. Step 5: Solve for x
    x = 390,494,234,362.14/611,999.40
  6. Step 6: Final answer
    x = 638,063.10

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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.