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Finding the Fourth Proportional to 178.03, 266.90 and 86.68

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Solution

The fourth proportional to 178.03, 266.90 and 86.68 is: 129.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.03 : 266.90 = 86.68 : x
  2. Step 2: Convert to fraction form
    178.03/266.90 = 86.68/x
  3. Step 3: Cross multiply
    178.03x = 266.90 × 86.68
  4. Step 4: Simplify right side
    178.03x = 23,134.46
  5. Step 5: Solve for x
    x = 23,134.46/178.03
  6. Step 6: Final answer
    x = 129.95

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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.