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Finding the Fourth Proportional to 196.50, 294.78 and 74.76

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Solution

The fourth proportional to 196.50, 294.78 and 74.76 is: 112.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.50 : 294.78 = 74.76 : x
  2. Step 2: Convert to fraction form
    196.50/294.78 = 74.76/x
  3. Step 3: Cross multiply
    196.50x = 294.78 × 74.76
  4. Step 4: Simplify right side
    196.50x = 22,037.75
  5. Step 5: Solve for x
    x = 22,037.75/196.50
  6. Step 6: Final answer
    x = 112.15

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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.