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Finding the Fourth Proportional to 178.62, 247.14 and 171.90

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Solution

The fourth proportional to 178.62, 247.14 and 171.90 is: 237.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.62 : 247.14 = 171.90 : x
  2. Step 2: Convert to fraction form
    178.62/247.14 = 171.90/x
  3. Step 3: Cross multiply
    178.62x = 247.14 × 171.90
  4. Step 4: Simplify right side
    178.62x = 42,483.37
  5. Step 5: Solve for x
    x = 42,483.37/178.62
  6. Step 6: Final answer
    x = 237.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.