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Finding the Fourth Proportional to 100,928.97, 139,275.32 and 60,618.78

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Solution

The fourth proportional to 100,928.97, 139,275.32 and 60,618.78 is: 83,649.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,928.97 : 139,275.32 = 60,618.78 : x
  2. Step 2: Convert to fraction form
    100,928.97/139,275.32 = 60,618.78/x
  3. Step 3: Cross multiply
    100,928.97x = 139,275.32 × 60,618.78
  4. Step 4: Simplify right side
    100,928.97x = 8,442,699,679.42
  5. Step 5: Solve for x
    x = 8,442,699,679.42/100,928.97
  6. Step 6: Final answer
    x = 83,649.91

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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.