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Finding the Fourth Proportional to 178.04, 266.96 and 86.78

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Solution

The fourth proportional to 178.04, 266.96 and 86.78 is: 130.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.04 : 266.96 = 86.78 : x
  2. Step 2: Convert to fraction form
    178.04/266.96 = 86.78/x
  3. Step 3: Cross multiply
    178.04x = 266.96 × 86.78
  4. Step 4: Simplify right side
    178.04x = 23,167.67
  5. Step 5: Solve for x
    x = 23,167.67/178.04
  6. Step 6: Final answer
    x = 130.12

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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.