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Finding the Fourth Proportional to 79,115.88, 109,182.92 and 45,129.90

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Solution

The fourth proportional to 79,115.88, 109,182.92 and 45,129.90 is: 62,280.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,115.88 : 109,182.92 = 45,129.90 : x
  2. Step 2: Convert to fraction form
    79,115.88/109,182.92 = 45,129.90/x
  3. Step 3: Cross multiply
    79,115.88x = 109,182.92 × 45,129.90
  4. Step 4: Simplify right side
    79,115.88x = 4,927,414,261.31
  5. Step 5: Solve for x
    x = 4,927,414,261.31/79,115.88
  6. Step 6: Final answer
    x = 62,280.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.