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Finding the Fourth Proportional to 178.32, 245.84 and 138.86

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Solution

The fourth proportional to 178.32, 245.84 and 138.86 is: 191.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.32 : 245.84 = 138.86 : x
  2. Step 2: Convert to fraction form
    178.32/245.84 = 138.86/x
  3. Step 3: Cross multiply
    178.32x = 245.84 × 138.86
  4. Step 4: Simplify right side
    178.32x = 34,135.42
  5. Step 5: Solve for x
    x = 34,135.42/178.32
  6. Step 6: Final answer
    x = 191.43

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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.