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Finding the Fourth Proportional to 86,681.80, 129,828.30 and 71,129.80

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Solution

The fourth proportional to 86,681.80, 129,828.30 and 71,129.80 is: 106,535.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,681.80 : 129,828.30 = 71,129.80 : x
  2. Step 2: Convert to fraction form
    86,681.80/129,828.30 = 71,129.80/x
  3. Step 3: Cross multiply
    86,681.80x = 129,828.30 × 71,129.80
  4. Step 4: Simplify right side
    86,681.80x = 9,234,661,013.34
  5. Step 5: Solve for x
    x = 9,234,661,013.34/86,681.80
  6. Step 6: Final answer
    x = 106,535.18

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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.