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Finding the Fourth Proportional to 86,679.30, 129,824.55 and 71,127.30

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Solution

The fourth proportional to 86,679.30, 129,824.55 and 71,127.30 is: 106,531.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,679.30 : 129,824.55 = 71,127.30 : x
  2. Step 2: Convert to fraction form
    86,679.30/129,824.55 = 71,127.30/x
  3. Step 3: Cross multiply
    86,679.30x = 129,824.55 × 71,127.30
  4. Step 4: Simplify right side
    86,679.30x = 9,234,069,715.22
  5. Step 5: Solve for x
    x = 9,234,069,715.22/86,679.30
  6. Step 6: Final answer
    x = 106,531.43

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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.