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Finding the Fourth Proportional to 178.65, 267.97 and 142.80

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Solution

The fourth proportional to 178.65, 267.97 and 142.80 is: 214.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.65 : 267.97 = 142.80 : x
  2. Step 2: Convert to fraction form
    178.65/267.97 = 142.80/x
  3. Step 3: Cross multiply
    178.65x = 267.97 × 142.80
  4. Step 4: Simplify right side
    178.65x = 38,265.40
  5. Step 5: Solve for x
    x = 38,265.40/178.65
  6. Step 6: Final answer
    x = 214.20

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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.