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Finding the Third Proportional to 720.38 and 1,087.88

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Solution

The third proportional to 720.38 and 1,087.88 is: 1,642.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.38 : 1,087.88 = 1,087.88 : x
  2. Step 2: Convert to fraction form
    720.38/1,087.88 = 1,087.88/x
  3. Step 3: Cross multiply
    720.38x = 1,087.88 × 1,087.88
  4. Step 4: Simplify right side
    720.38x = 1,183,472.02
  5. Step 5: Solve for x
    x = 1,183,472.02/720.38
  6. Step 6: Final answer
    x = 1,642.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.