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Finding the Fourth Proportional to 72.81, 108.80 and 55.11

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Solution

The fourth proportional to 72.81, 108.80 and 55.11 is: 82.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.81 : 108.80 = 55.11 : x
  2. Step 2: Convert to fraction form
    72.81/108.80 = 55.11/x
  3. Step 3: Cross multiply
    72.81x = 108.80 × 55.11
  4. Step 4: Simplify right side
    72.81x = 5,995.46
  5. Step 5: Solve for x
    x = 5,995.46/72.81
  6. Step 6: Final answer
    x = 82.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.