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Finding the Fourth Proportional to 178.20, 266.82 and 139.76

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Solution

The fourth proportional to 178.20, 266.82 and 139.76 is: 209.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.20 : 266.82 = 139.76 : x
  2. Step 2: Convert to fraction form
    178.20/266.82 = 139.76/x
  3. Step 3: Cross multiply
    178.20x = 266.82 × 139.76
  4. Step 4: Simplify right side
    178.20x = 37,289.43
  5. Step 5: Solve for x
    x = 37,289.43/178.20
  6. Step 6: Final answer
    x = 209.26

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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.