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Finding the Fourth Proportional to 311.62, 467.51 and 103.40

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Solution

The fourth proportional to 311.62, 467.51 and 103.40 is: 155.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.62 : 467.51 = 103.40 : x
  2. Step 2: Convert to fraction form
    311.62/467.51 = 103.40/x
  3. Step 3: Cross multiply
    311.62x = 467.51 × 103.40
  4. Step 4: Simplify right side
    311.62x = 48,340.53
  5. Step 5: Solve for x
    x = 48,340.53/311.62
  6. Step 6: Final answer
    x = 155.13

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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.