Home / 90,853.20-136,425.60-68,691.60

Finding the Fourth Proportional to 90,853.20, 136,425.60 and 68,691.60

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Solution

The fourth proportional to 90,853.20, 136,425.60 and 68,691.60 is: 103,147.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,853.20 : 136,425.60 = 68,691.60 : x
  2. Step 2: Convert to fraction form
    90,853.20/136,425.60 = 68,691.60/x
  3. Step 3: Cross multiply
    90,853.20x = 136,425.60 × 68,691.60
  4. Step 4: Simplify right side
    90,853.20x = 9,371,292,744.96
  5. Step 5: Solve for x
    x = 9,371,292,744.96/90,853.20
  6. Step 6: Final answer
    x = 103,147.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.