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Finding the Fourth Proportional to 15,197.20, 20,981.75 and 10,425.13

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Solution

The fourth proportional to 15,197.20, 20,981.75 and 10,425.13 is: 14,393.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,197.20 : 20,981.75 = 10,425.13 : x
  2. Step 2: Convert to fraction form
    15,197.20/20,981.75 = 10,425.13/x
  3. Step 3: Cross multiply
    15,197.20x = 20,981.75 × 10,425.13
  4. Step 4: Simplify right side
    15,197.20x = 218,737,366.80
  5. Step 5: Solve for x
    x = 218,737,366.80/15,197.20
  6. Step 6: Final answer
    x = 14,393.27

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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.