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Finding the Third Proportional to 7,490 and 12,230

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Solution

The third proportional to 7,490 and 12,230 is: 19,969.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,490 : 12,230 = 12,230 : x
  2. Step 2: Convert to fraction form
    7,490/12,230 = 12,230/x
  3. Step 3: Cross multiply
    7,490x = 12,230 × 12,230
  4. Step 4: Simplify right side
    7,490x = 149,572,900
  5. Step 5: Solve for x
    x = 149,572,900/7,490
  6. Step 6: Final answer
    x = 19,969.68

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.