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Finding the Fourth Proportional to 15,017.20, 20,723.99 and 8,729.57

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Solution

The fourth proportional to 15,017.20, 20,723.99 and 8,729.57 is: 12,046.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,017.20 : 20,723.99 = 8,729.57 : x
  2. Step 2: Convert to fraction form
    15,017.20/20,723.99 = 8,729.57/x
  3. Step 3: Cross multiply
    15,017.20x = 20,723.99 × 8,729.57
  4. Step 4: Simplify right side
    15,017.20x = 180,911,529.55
  5. Step 5: Solve for x
    x = 180,911,529.55/15,017.20
  6. Step 6: Final answer
    x = 12,046.96

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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.