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Finding the Fourth Proportional to 72.68, 100.17 and 55.17

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Solution

The fourth proportional to 72.68, 100.17 and 55.17 is: 76.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.68 : 100.17 = 55.17 : x
  2. Step 2: Convert to fraction form
    72.68/100.17 = 55.17/x
  3. Step 3: Cross multiply
    72.68x = 100.17 × 55.17
  4. Step 4: Simplify right side
    72.68x = 5,526.38
  5. Step 5: Solve for x
    x = 5,526.38/72.68
  6. Step 6: Final answer
    x = 76.04

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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.