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Finding the Third Proportional to 690.75 and 1,078.13

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Solution

The third proportional to 690.75 and 1,078.13 is: 1,682.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.75 : 1,078.13 = 1,078.13 : x
  2. Step 2: Convert to fraction form
    690.75/1,078.13 = 1,078.13/x
  3. Step 3: Cross multiply
    690.75x = 1,078.13 × 1,078.13
  4. Step 4: Simplify right side
    690.75x = 1,162,353.52
  5. Step 5: Solve for x
    x = 1,162,353.52/690.75
  6. Step 6: Final answer
    x = 1,682.74

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.