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Finding the Fourth Proportional to 178.28, 245.98 and 112.76

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Solution

The fourth proportional to 178.28, 245.98 and 112.76 is: 155.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.28 : 245.98 = 112.76 : x
  2. Step 2: Convert to fraction form
    178.28/245.98 = 112.76/x
  3. Step 3: Cross multiply
    178.28x = 245.98 × 112.76
  4. Step 4: Simplify right side
    178.28x = 27,736.70
  5. Step 5: Solve for x
    x = 27,736.70/178.28
  6. Step 6: Final answer
    x = 155.58

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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.