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Finding the Fourth Proportional to 72,931.30, 100,645.17 and 39,397.30

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Solution

The fourth proportional to 72,931.30, 100,645.17 and 39,397.30 is: 54,368.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,931.30 : 100,645.17 = 39,397.30 : x
  2. Step 2: Convert to fraction form
    72,931.30/100,645.17 = 39,397.30/x
  3. Step 3: Cross multiply
    72,931.30x = 100,645.17 × 39,397.30
  4. Step 4: Simplify right side
    72,931.30x = 3,965,147,956.04
  5. Step 5: Solve for x
    x = 3,965,147,956.04/72,931.30
  6. Step 6: Final answer
    x = 54,368.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.