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Finding the Fourth Proportional to 178.11, 266.88 and 123.90

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Solution

The fourth proportional to 178.11, 266.88 and 123.90 is: 185.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.11 : 266.88 = 123.90 : x
  2. Step 2: Convert to fraction form
    178.11/266.88 = 123.90/x
  3. Step 3: Cross multiply
    178.11x = 266.88 × 123.90
  4. Step 4: Simplify right side
    178.11x = 33,066.43
  5. Step 5: Solve for x
    x = 33,066.43/178.11
  6. Step 6: Final answer
    x = 185.65

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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.