Home / 100,781.38-139,097.55-66,729.79

Finding the Fourth Proportional to 100,781.38, 139,097.55 and 66,729.79

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Solution

The fourth proportional to 100,781.38, 139,097.55 and 66,729.79 is: 92,099.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,781.38 : 139,097.55 = 66,729.79 : x
  2. Step 2: Convert to fraction form
    100,781.38/139,097.55 = 66,729.79/x
  3. Step 3: Cross multiply
    100,781.38x = 139,097.55 × 66,729.79
  4. Step 4: Simplify right side
    100,781.38x = 9,281,950,301.01
  5. Step 5: Solve for x
    x = 9,281,950,301.01/100,781.38
  6. Step 6: Final answer
    x = 92,099.85

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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.