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Finding the Fourth Proportional to 124.52, 171.86 and 72.80

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Solution

The fourth proportional to 124.52, 171.86 and 72.80 is: 100.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.52 : 171.86 = 72.80 : x
  2. Step 2: Convert to fraction form
    124.52/171.86 = 72.80/x
  3. Step 3: Cross multiply
    124.52x = 171.86 × 72.80
  4. Step 4: Simplify right side
    124.52x = 12,511.41
  5. Step 5: Solve for x
    x = 12,511.41/124.52
  6. Step 6: Final answer
    x = 100.48

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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.