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Finding the Fourth Proportional to 438,145.70, 657,218.55 and 171,914.90

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Solution

The fourth proportional to 438,145.70, 657,218.55 and 171,914.90 is: 257,872.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,145.70 : 657,218.55 = 171,914.90 : x
  2. Step 2: Convert to fraction form
    438,145.70/657,218.55 = 171,914.90/x
  3. Step 3: Cross multiply
    438,145.70x = 657,218.55 × 171,914.90
  4. Step 4: Simplify right side
    438,145.70x = 112,985,661,301.40
  5. Step 5: Solve for x
    x = 112,985,661,301.40/438,145.70
  6. Step 6: Final answer
    x = 257,872.35

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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.