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Finding the Third Proportional to 691.31 and 1,603.13

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Solution

The third proportional to 691.31 and 1,603.13 is: 3,717.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.31 : 1,603.13 = 1,603.13 : x
  2. Step 2: Convert to fraction form
    691.31/1,603.13 = 1,603.13/x
  3. Step 3: Cross multiply
    691.31x = 1,603.13 × 1,603.13
  4. Step 4: Simplify right side
    691.31x = 2,570,009.77
  5. Step 5: Solve for x
    x = 2,570,009.77/691.31
  6. Step 6: Final answer
    x = 3,717.58

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.