Home / 81,013.10-121,519.65-73,139.90

Finding the Fourth Proportional to 81,013.10, 121,519.65 and 73,139.90

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Solution

The fourth proportional to 81,013.10, 121,519.65 and 73,139.90 is: 109,709.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,013.10 : 121,519.65 = 73,139.90 : x
  2. Step 2: Convert to fraction form
    81,013.10/121,519.65 = 73,139.90/x
  3. Step 3: Cross multiply
    81,013.10x = 121,519.65 × 73,139.90
  4. Step 4: Simplify right side
    81,013.10x = 8,887,935,049.04
  5. Step 5: Solve for x
    x = 8,887,935,049.04/81,013.10
  6. Step 6: Final answer
    x = 109,709.85

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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.