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Finding the Fourth Proportional to 20,872.80, 28,806.02 and 12,919.65

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Solution

The fourth proportional to 20,872.80, 28,806.02 and 12,919.65 is: 17,830.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.80 : 28,806.02 = 12,919.65 : x
  2. Step 2: Convert to fraction form
    20,872.80/28,806.02 = 12,919.65/x
  3. Step 3: Cross multiply
    20,872.80x = 28,806.02 × 12,919.65
  4. Step 4: Simplify right side
    20,872.80x = 372,163,631.69
  5. Step 5: Solve for x
    x = 372,163,631.69/20,872.80
  6. Step 6: Final answer
    x = 17,830.08

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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.