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Finding the Third Proportional to 7,478 and 9,915

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Solution

The third proportional to 7,478 and 9,915 is: 13,146.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,478 : 9,915 = 9,915 : x
  2. Step 2: Convert to fraction form
    7,478/9,915 = 9,915/x
  3. Step 3: Cross multiply
    7,478x = 9,915 × 9,915
  4. Step 4: Simplify right side
    7,478x = 98,307,225
  5. Step 5: Solve for x
    x = 98,307,225/7,478
  6. Step 6: Final answer
    x = 13,146.19

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.