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Finding the Fourth Proportional to 196.80, 294.67 and 128.15

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Solution

The fourth proportional to 196.80, 294.67 and 128.15 is: 191.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.80 : 294.67 = 128.15 : x
  2. Step 2: Convert to fraction form
    196.80/294.67 = 128.15/x
  3. Step 3: Cross multiply
    196.80x = 294.67 × 128.15
  4. Step 4: Simplify right side
    196.80x = 37,762.38
  5. Step 5: Solve for x
    x = 37,762.38/196.80
  6. Step 6: Final answer
    x = 191.88

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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.