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Finding the Fourth Proportional to 311.16, 466.78 and 128.52

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Solution

The fourth proportional to 311.16, 466.78 and 128.52 is: 192.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.16 : 466.78 = 128.52 : x
  2. Step 2: Convert to fraction form
    311.16/466.78 = 128.52/x
  3. Step 3: Cross multiply
    311.16x = 466.78 × 128.52
  4. Step 4: Simplify right side
    311.16x = 59,990.57
  5. Step 5: Solve for x
    x = 59,990.57/311.16
  6. Step 6: Final answer
    x = 192.80

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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.