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Finding the Fourth Proportional to 20,635.87, 28,475.71 and 12,020.71

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Solution

The fourth proportional to 20,635.87, 28,475.71 and 12,020.71 is: 16,587.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,635.87 : 28,475.71 = 12,020.71 : x
  2. Step 2: Convert to fraction form
    20,635.87/28,475.71 = 12,020.71/x
  3. Step 3: Cross multiply
    20,635.87x = 28,475.71 × 12,020.71
  4. Step 4: Simplify right side
    20,635.87x = 342,298,251.95
  5. Step 5: Solve for x
    x = 342,298,251.95/20,635.87
  6. Step 6: Final answer
    x = 16,587.54

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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.