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Finding the Fourth Proportional to 81,134.20, 121,612.20 and 28,516.60

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Solution

The fourth proportional to 81,134.20, 121,612.20 and 28,516.60 is: 42,743.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,134.20 : 121,612.20 = 28,516.60 : x
  2. Step 2: Convert to fraction form
    81,134.20/121,612.20 = 28,516.60/x
  3. Step 3: Cross multiply
    81,134.20x = 121,612.20 × 28,516.60
  4. Step 4: Simplify right side
    81,134.20x = 3,467,966,462.52
  5. Step 5: Solve for x
    x = 3,467,966,462.52/81,134.20
  6. Step 6: Final answer
    x = 42,743.58

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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.