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Finding the Fourth Proportional to 178.28, 245.88 and 112.76

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Solution

The fourth proportional to 178.28, 245.88 and 112.76 is: 155.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.28 : 245.88 = 112.76 : x
  2. Step 2: Convert to fraction form
    178.28/245.88 = 112.76/x
  3. Step 3: Cross multiply
    178.28x = 245.88 × 112.76
  4. Step 4: Simplify right side
    178.28x = 27,725.43
  5. Step 5: Solve for x
    x = 27,725.43/178.28
  6. Step 6: Final answer
    x = 155.52

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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.