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Finding the Fourth Proportional to 103,588.80, 142,876.80 and 67,721.28

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Solution

The fourth proportional to 103,588.80, 142,876.80 and 67,721.28 is: 93,405.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,588.80 : 142,876.80 = 67,721.28 : x
  2. Step 2: Convert to fraction form
    103,588.80/142,876.80 = 67,721.28/x
  3. Step 3: Cross multiply
    103,588.80x = 142,876.80 × 67,721.28
  4. Step 4: Simplify right side
    103,588.80x = 9,675,799,778.30
  5. Step 5: Solve for x
    x = 9,675,799,778.30/103,588.80
  6. Step 6: Final answer
    x = 93,405.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.