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Finding the Third Proportional to 311.50 and 472

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Solution

The third proportional to 311.50 and 472 is: 715.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.50 : 472 = 472 : x
  2. Step 2: Convert to fraction form
    311.50/472 = 472/x
  3. Step 3: Cross multiply
    311.50x = 472 × 472
  4. Step 4: Simplify right side
    311.50x = 222,784
  5. Step 5: Solve for x
    x = 222,784/311.50
  6. Step 6: Final answer
    x = 715.20

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.