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Finding the Fourth Proportional to 81,272.52, 121,918.86 and 28,671.48

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Solution

The fourth proportional to 81,272.52, 121,918.86 and 28,671.48 is: 43,010.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,272.52 : 121,918.86 = 28,671.48 : x
  2. Step 2: Convert to fraction form
    81,272.52/121,918.86 = 28,671.48/x
  3. Step 3: Cross multiply
    81,272.52x = 121,918.86 × 28,671.48
  4. Step 4: Simplify right side
    81,272.52x = 3,495,594,156.11
  5. Step 5: Solve for x
    x = 3,495,594,156.11/81,272.52
  6. Step 6: Final answer
    x = 43,010.78

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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.