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Finding the Third Proportional to 691.38 and 1,070.63

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Solution

The third proportional to 691.38 and 1,070.63 is: 1,657.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.38 : 1,070.63 = 1,070.63 : x
  2. Step 2: Convert to fraction form
    691.38/1,070.63 = 1,070.63/x
  3. Step 3: Cross multiply
    691.38x = 1,070.63 × 1,070.63
  4. Step 4: Simplify right side
    691.38x = 1,146,237.89
  5. Step 5: Solve for x
    x = 1,146,237.89/691.38
  6. Step 6: Final answer
    x = 1,657.91

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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.