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Finding the Fourth Proportional to 177.72, 266.62 and 86.42

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Solution

The fourth proportional to 177.72, 266.62 and 86.42 is: 129.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.72 : 266.62 = 86.42 : x
  2. Step 2: Convert to fraction form
    177.72/266.62 = 86.42/x
  3. Step 3: Cross multiply
    177.72x = 266.62 × 86.42
  4. Step 4: Simplify right side
    177.72x = 23,041.30
  5. Step 5: Solve for x
    x = 23,041.30/177.72
  6. Step 6: Final answer
    x = 129.65

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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.