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Finding the Fourth Proportional to 71,385.81, 107,127.15 and 38,129.76

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Solution

The fourth proportional to 71,385.81, 107,127.15 and 38,129.76 is: 57,220.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,385.81 : 107,127.15 = 38,129.76 : x
  2. Step 2: Convert to fraction form
    71,385.81/107,127.15 = 38,129.76/x
  3. Step 3: Cross multiply
    71,385.81x = 107,127.15 × 38,129.76
  4. Step 4: Simplify right side
    71,385.81x = 4,084,732,518.98
  5. Step 5: Solve for x
    x = 4,084,732,518.98/71,385.81
  6. Step 6: Final answer
    x = 57,220.51

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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.