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Finding the Third Proportional to 6,690 and 9,428

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Solution

The third proportional to 6,690 and 9,428 is: 13,286.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,690 : 9,428 = 9,428 : x
  2. Step 2: Convert to fraction form
    6,690/9,428 = 9,428/x
  3. Step 3: Cross multiply
    6,690x = 9,428 × 9,428
  4. Step 4: Simplify right side
    6,690x = 88,887,184
  5. Step 5: Solve for x
    x = 88,887,184/6,690
  6. Step 6: Final answer
    x = 13,286.57

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.