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Finding the Third Proportional to 715 and 1,040

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Solution

The third proportional to 715 and 1,040 is: 1,512.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    715 : 1,040 = 1,040 : x
  2. Step 2: Convert to fraction form
    715/1,040 = 1,040/x
  3. Step 3: Cross multiply
    715x = 1,040 × 1,040
  4. Step 4: Simplify right side
    715x = 1,081,600
  5. Step 5: Solve for x
    x = 1,081,600/715
  6. Step 6: Final answer
    x = 1,512.73

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.