Home / 90,925.20-136,412.10-81,132.30

Finding the Fourth Proportional to 90,925.20, 136,412.10 and 81,132.30

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Solution

The fourth proportional to 90,925.20, 136,412.10 and 81,132.30 is: 121,720.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,925.20 : 136,412.10 = 81,132.30 : x
  2. Step 2: Convert to fraction form
    90,925.20/136,412.10 = 81,132.30/x
  3. Step 3: Cross multiply
    90,925.20x = 136,412.10 × 81,132.30
  4. Step 4: Simplify right side
    90,925.20x = 11,067,427,420.83
  5. Step 5: Solve for x
    x = 11,067,427,420.83/90,925.20
  6. Step 6: Final answer
    x = 121,720.13

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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.