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Finding the Third Proportional to 489.38 and 715.69

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Solution

The third proportional to 489.38 and 715.69 is: 1,046.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.38 : 715.69 = 715.69 : x
  2. Step 2: Convert to fraction form
    489.38/715.69 = 715.69/x
  3. Step 3: Cross multiply
    489.38x = 715.69 × 715.69
  4. Step 4: Simplify right side
    489.38x = 512,208.60
  5. Step 5: Solve for x
    x = 512,208.60/489.38
  6. Step 6: Final answer
    x = 1,046.66

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.