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Finding the Fourth Proportional to 69,001.20, 103,428.90 and 39,355.20

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Solution

The fourth proportional to 69,001.20, 103,428.90 and 39,355.20 is: 58,991.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,001.20 : 103,428.90 = 39,355.20 : x
  2. Step 2: Convert to fraction form
    69,001.20/103,428.90 = 39,355.20/x
  3. Step 3: Cross multiply
    69,001.20x = 103,428.90 × 39,355.20
  4. Step 4: Simplify right side
    69,001.20x = 4,070,465,045.28
  5. Step 5: Solve for x
    x = 4,070,465,045.28/69,001.20
  6. Step 6: Final answer
    x = 58,991.22

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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.