Home / 90,649.38-124,652.49-78,691.80

Finding the Fourth Proportional to 90,649.38, 124,652.49 and 78,691.80

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Solution

The fourth proportional to 90,649.38, 124,652.49 and 78,691.80 is: 108,209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,649.38 : 124,652.49 = 78,691.80 : x
  2. Step 2: Convert to fraction form
    90,649.38/124,652.49 = 78,691.80/x
  3. Step 3: Cross multiply
    90,649.38x = 124,652.49 × 78,691.80
  4. Step 4: Simplify right side
    90,649.38x = 9,809,128,812.58
  5. Step 5: Solve for x
    x = 9,809,128,812.58/90,649.38
  6. Step 6: Final answer
    x = 108,209.55

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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.