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Finding the Fourth Proportional to 196.48, 294.08 and 128.16

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Solution

The fourth proportional to 196.48, 294.08 and 128.16 is: 191.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.48 : 294.08 = 128.16 : x
  2. Step 2: Convert to fraction form
    196.48/294.08 = 128.16/x
  3. Step 3: Cross multiply
    196.48x = 294.08 × 128.16
  4. Step 4: Simplify right side
    196.48x = 37,689.29
  5. Step 5: Solve for x
    x = 37,689.29/196.48
  6. Step 6: Final answer
    x = 191.82

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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.