Home / 100,780.38-139,096.17-66,728.79

Finding the Fourth Proportional to 100,780.38, 139,096.17 and 66,728.79

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Solution

The fourth proportional to 100,780.38, 139,096.17 and 66,728.79 is: 92,098.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,780.38 : 139,096.17 = 66,728.79 : x
  2. Step 2: Convert to fraction form
    100,780.38/139,096.17 = 66,728.79/x
  3. Step 3: Cross multiply
    100,780.38x = 139,096.17 × 66,728.79
  4. Step 4: Simplify right side
    100,780.38x = 9,281,719,117.73
  5. Step 5: Solve for x
    x = 9,281,719,117.73/100,780.38
  6. Step 6: Final answer
    x = 92,098.47

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1.5x scale

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.