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Finding the Fourth Proportional to 80,689.54, 121,034.86 and 28,098.86

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Solution

The fourth proportional to 80,689.54, 121,034.86 and 28,098.86 is: 42,148.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,689.54 : 121,034.86 = 28,098.86 : x
  2. Step 2: Convert to fraction form
    80,689.54/121,034.86 = 28,098.86/x
  3. Step 3: Cross multiply
    80,689.54x = 121,034.86 × 28,098.86
  4. Step 4: Simplify right side
    80,689.54x = 3,400,941,586.26
  5. Step 5: Solve for x
    x = 3,400,941,586.26/80,689.54
  6. Step 6: Final answer
    x = 42,148.48

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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.