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Finding the Fourth Proportional to 85,191.24, 127,691.28 and 28,978.86

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Solution

The fourth proportional to 85,191.24, 127,691.28 and 28,978.86 is: 43,435.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,191.24 : 127,691.28 = 28,978.86 : x
  2. Step 2: Convert to fraction form
    85,191.24/127,691.28 = 28,978.86/x
  3. Step 3: Cross multiply
    85,191.24x = 127,691.28 × 28,978.86
  4. Step 4: Simplify right side
    85,191.24x = 3,700,347,726.34
  5. Step 5: Solve for x
    x = 3,700,347,726.34/85,191.24
  6. Step 6: Final answer
    x = 43,435.78

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1.5x scale

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.