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Finding the Fourth Proportional to 20,125.80, 30,188.70 and 15,454.80

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Solution

The fourth proportional to 20,125.80, 30,188.70 and 15,454.80 is: 23,182.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,125.80 : 30,188.70 = 15,454.80 : x
  2. Step 2: Convert to fraction form
    20,125.80/30,188.70 = 15,454.80/x
  3. Step 3: Cross multiply
    20,125.80x = 30,188.70 × 15,454.80
  4. Step 4: Simplify right side
    20,125.80x = 466,560,320.76
  5. Step 5: Solve for x
    x = 466,560,320.76/20,125.80
  6. Step 6: Final answer
    x = 23,182.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.