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Finding the Fourth Proportional to 72.55, 100.13 and 63.61

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Solution

The fourth proportional to 72.55, 100.13 and 63.61 is: 87.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.55 : 100.13 = 63.61 : x
  2. Step 2: Convert to fraction form
    72.55/100.13 = 63.61/x
  3. Step 3: Cross multiply
    72.55x = 100.13 × 63.61
  4. Step 4: Simplify right side
    72.55x = 6,368.45
  5. Step 5: Solve for x
    x = 6,368.45/72.55
  6. Step 6: Final answer
    x = 87.78

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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.