Home / 90,932.20-136,422.60-81,139.30

Finding the Fourth Proportional to 90,932.20, 136,422.60 and 81,139.30

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Solution

The fourth proportional to 90,932.20, 136,422.60 and 81,139.30 is: 121,730.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,932.20 : 136,422.60 = 81,139.30 : x
  2. Step 2: Convert to fraction form
    90,932.20/136,422.60 = 81,139.30/x
  3. Step 3: Cross multiply
    90,932.20x = 136,422.60 × 81,139.30
  4. Step 4: Simplify right side
    90,932.20x = 11,069,234,268.18
  5. Step 5: Solve for x
    x = 11,069,234,268.18/90,932.20
  6. Step 6: Final answer
    x = 121,730.63

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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.