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Finding the Fourth Proportional to 311.29, 466.25 and 128.13

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Solution

The fourth proportional to 311.29, 466.25 and 128.13 is: 191.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.29 : 466.25 = 128.13 : x
  2. Step 2: Convert to fraction form
    311.29/466.25 = 128.13/x
  3. Step 3: Cross multiply
    311.29x = 466.25 × 128.13
  4. Step 4: Simplify right side
    311.29x = 59,740.61
  5. Step 5: Solve for x
    x = 59,740.61/311.29
  6. Step 6: Final answer
    x = 191.91

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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.