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Finding the Fourth Proportional to 177.90, 266.66 and 86.47

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Solution

The fourth proportional to 177.90, 266.66 and 86.47 is: 129.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.90 : 266.66 = 86.47 : x
  2. Step 2: Convert to fraction form
    177.90/266.66 = 86.47/x
  3. Step 3: Cross multiply
    177.90x = 266.66 × 86.47
  4. Step 4: Simplify right side
    177.90x = 23,057.32
  5. Step 5: Solve for x
    x = 23,057.32/177.90
  6. Step 6: Final answer
    x = 129.61

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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.