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Finding the Third Proportional to 7,470 and 12,312

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Solution

The third proportional to 7,470 and 12,312 is: 20,292.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,470 : 12,312 = 12,312 : x
  2. Step 2: Convert to fraction form
    7,470/12,312 = 12,312/x
  3. Step 3: Cross multiply
    7,470x = 12,312 × 12,312
  4. Step 4: Simplify right side
    7,470x = 151,585,344
  5. Step 5: Solve for x
    x = 151,585,344/7,470
  6. Step 6: Final answer
    x = 20,292.55

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.