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Finding the Fourth Proportional to 103,279.80, 142,473.42 and 67,490.76

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Solution

The fourth proportional to 103,279.80, 142,473.42 and 67,490.76 is: 93,102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,279.80 : 142,473.42 = 67,490.76 : x
  2. Step 2: Convert to fraction form
    103,279.80/142,473.42 = 67,490.76/x
  3. Step 3: Cross multiply
    103,279.80x = 142,473.42 × 67,490.76
  4. Step 4: Simplify right side
    103,279.80x = 9,615,639,395.60
  5. Step 5: Solve for x
    x = 9,615,639,395.60/103,279.80
  6. Step 6: Final answer
    x = 93,102.81

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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.