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Finding the Third Proportional to 691.50 and 1,221.50

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Solution

The third proportional to 691.50 and 1,221.50 is: 2,157.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.50 : 1,221.50 = 1,221.50 : x
  2. Step 2: Convert to fraction form
    691.50/1,221.50 = 1,221.50/x
  3. Step 3: Cross multiply
    691.50x = 1,221.50 × 1,221.50
  4. Step 4: Simplify right side
    691.50x = 1,492,062.25
  5. Step 5: Solve for x
    x = 1,492,062.25/691.50
  6. Step 6: Final answer
    x = 2,157.72

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.