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Finding the Third Proportional to 672 and 1,040

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Solution

The third proportional to 672 and 1,040 is: 1,609.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    672 : 1,040 = 1,040 : x
  2. Step 2: Convert to fraction form
    672/1,040 = 1,040/x
  3. Step 3: Cross multiply
    672x = 1,040 × 1,040
  4. Step 4: Simplify right side
    672x = 1,081,600
  5. Step 5: Solve for x
    x = 1,081,600/672
  6. Step 6: Final answer
    x = 1,609.52

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.