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Finding the Fourth Proportional to 18,469.90, 25,489.49 and 10,920.65

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Solution

The fourth proportional to 18,469.90, 25,489.49 and 10,920.65 is: 15,071.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,469.90 : 25,489.49 = 10,920.65 : x
  2. Step 2: Convert to fraction form
    18,469.90/25,489.49 = 10,920.65/x
  3. Step 3: Cross multiply
    18,469.90x = 25,489.49 × 10,920.65
  4. Step 4: Simplify right side
    18,469.90x = 278,361,688.61
  5. Step 5: Solve for x
    x = 278,361,688.61/18,469.90
  6. Step 6: Final answer
    x = 15,071.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.