Home / 20,718.56-28,591.80-12,220.88

Finding the Fourth Proportional to 20,718.56, 28,591.80 and 12,220.88

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Solution

The fourth proportional to 20,718.56, 28,591.80 and 12,220.88 is: 16,864.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.56 : 28,591.80 = 12,220.88 : x
  2. Step 2: Convert to fraction form
    20,718.56/28,591.80 = 12,220.88/x
  3. Step 3: Cross multiply
    20,718.56x = 28,591.80 × 12,220.88
  4. Step 4: Simplify right side
    20,718.56x = 349,416,956.78
  5. Step 5: Solve for x
    x = 349,416,956.78/20,718.56
  6. Step 6: Final answer
    x = 16,864.92

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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.