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Finding the Fourth Proportional to 15,015.78, 20,723.04 and 8,728.56

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Solution

The fourth proportional to 15,015.78, 20,723.04 and 8,728.56 is: 12,046.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.78 : 20,723.04 = 8,728.56 : x
  2. Step 2: Convert to fraction form
    15,015.78/20,723.04 = 8,728.56/x
  3. Step 3: Cross multiply
    15,015.78x = 20,723.04 × 8,728.56
  4. Step 4: Simplify right side
    15,015.78x = 180,882,298.02
  5. Step 5: Solve for x
    x = 180,882,298.02/15,015.78
  6. Step 6: Final answer
    x = 12,046.15

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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.