Home / 81,156.11-122,288.12-66,689.10

Finding the Fourth Proportional to 81,156.11, 122,288.12 and 66,689.10

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Solution

The fourth proportional to 81,156.11, 122,288.12 and 66,689.10 is: 100,488.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,156.11 : 122,288.12 = 66,689.10 : x
  2. Step 2: Convert to fraction form
    81,156.11/122,288.12 = 66,689.10/x
  3. Step 3: Cross multiply
    81,156.11x = 122,288.12 × 66,689.10
  4. Step 4: Simplify right side
    81,156.11x = 8,155,284,330.05
  5. Step 5: Solve for x
    x = 8,155,284,330.05/81,156.11
  6. Step 6: Final answer
    x = 100,488.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.