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Finding the Fourth Proportional to 72.62, 108.96 and 55.26

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Solution

The fourth proportional to 72.62, 108.96 and 55.26 is: 82.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.62 : 108.96 = 55.26 : x
  2. Step 2: Convert to fraction form
    72.62/108.96 = 55.26/x
  3. Step 3: Cross multiply
    72.62x = 108.96 × 55.26
  4. Step 4: Simplify right side
    72.62x = 6,021.13
  5. Step 5: Solve for x
    x = 6,021.13/72.62
  6. Step 6: Final answer
    x = 82.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.