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Finding the Fourth Proportional to 86,487.81, 129,747.39 and 39,125.21

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Solution

The fourth proportional to 86,487.81, 129,747.39 and 39,125.21 is: 58,694.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,487.81 : 129,747.39 = 39,125.21 : x
  2. Step 2: Convert to fraction form
    86,487.81/129,747.39 = 39,125.21/x
  3. Step 3: Cross multiply
    86,487.81x = 129,747.39 × 39,125.21
  4. Step 4: Simplify right side
    86,487.81x = 5,076,393,880.70
  5. Step 5: Solve for x
    x = 5,076,393,880.70/86,487.81
  6. Step 6: Final answer
    x = 58,694.91

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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.