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Finding the Third Proportional to 370.13 and 487.69

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Solution

The third proportional to 370.13 and 487.69 is: 642.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.13 : 487.69 = 487.69 : x
  2. Step 2: Convert to fraction form
    370.13/487.69 = 487.69/x
  3. Step 3: Cross multiply
    370.13x = 487.69 × 487.69
  4. Step 4: Simplify right side
    370.13x = 237,839.10
  5. Step 5: Solve for x
    x = 237,839.10/370.13
  6. Step 6: Final answer
    x = 642.59

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.