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Finding the Third Proportional to 311.48 and 652.78

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Solution

The third proportional to 311.48 and 652.78 is: 1,368.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.48 : 652.78 = 652.78 : x
  2. Step 2: Convert to fraction form
    311.48/652.78 = 652.78/x
  3. Step 3: Cross multiply
    311.48x = 652.78 × 652.78
  4. Step 4: Simplify right side
    311.48x = 426,123.36
  5. Step 5: Solve for x
    x = 426,123.36/311.48
  6. Step 6: Final answer
    x = 1,368.04

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.