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Finding the Fourth Proportional to 18,469.20, 25,486.20 and 10,915.20

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Solution

The fourth proportional to 18,469.20, 25,486.20 and 10,915.20 is: 15,062.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,469.20 : 25,486.20 = 10,915.20 : x
  2. Step 2: Convert to fraction form
    18,469.20/25,486.20 = 10,915.20/x
  3. Step 3: Cross multiply
    18,469.20x = 25,486.20 × 10,915.20
  4. Step 4: Simplify right side
    18,469.20x = 278,186,970.24
  5. Step 5: Solve for x
    x = 278,186,970.24/18,469.20
  6. Step 6: Final answer
    x = 15,062.21

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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.