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Finding the Fourth Proportional to 72.66, 100.31 and 55.18

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Solution

The fourth proportional to 72.66, 100.31 and 55.18 is: 76.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.66 : 100.31 = 55.18 : x
  2. Step 2: Convert to fraction form
    72.66/100.31 = 55.18/x
  3. Step 3: Cross multiply
    72.66x = 100.31 × 55.18
  4. Step 4: Simplify right side
    72.66x = 5,534.96
  5. Step 5: Solve for x
    x = 5,534.96/72.66
  6. Step 6: Final answer
    x = 76.17

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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.