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Finding the Fourth Proportional to 20,478.69, 28,251.95 and 12,922.29

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Solution

The fourth proportional to 20,478.69, 28,251.95 and 12,922.29 is: 17,827.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.69 : 28,251.95 = 12,922.29 : x
  2. Step 2: Convert to fraction form
    20,478.69/28,251.95 = 12,922.29/x
  3. Step 3: Cross multiply
    20,478.69x = 28,251.95 × 12,922.29
  4. Step 4: Simplify right side
    20,478.69x = 365,079,826.35
  5. Step 5: Solve for x
    x = 365,079,826.35/20,478.69
  6. Step 6: Final answer
    x = 17,827.30

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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.