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Finding the Fourth Proportional to 81,151.40, 121,508.40 and 63,655.40

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Solution

The fourth proportional to 81,151.40, 121,508.40 and 63,655.40 is: 95,311.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,151.40 : 121,508.40 = 63,655.40 : x
  2. Step 2: Convert to fraction form
    81,151.40/121,508.40 = 63,655.40/x
  3. Step 3: Cross multiply
    81,151.40x = 121,508.40 × 63,655.40
  4. Step 4: Simplify right side
    81,151.40x = 7,734,665,805.36
  5. Step 5: Solve for x
    x = 7,734,665,805.36/81,151.40
  6. Step 6: Final answer
    x = 95,311.55

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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.