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Finding the Fourth Proportional to 20,842.59, 28,759.68 and 12,661.95

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Solution

The fourth proportional to 20,842.59, 28,759.68 and 12,661.95 is: 17,471.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,842.59 : 28,759.68 = 12,661.95 : x
  2. Step 2: Convert to fraction form
    20,842.59/28,759.68 = 12,661.95/x
  3. Step 3: Cross multiply
    20,842.59x = 28,759.68 × 12,661.95
  4. Step 4: Simplify right side
    20,842.59x = 364,153,530.98
  5. Step 5: Solve for x
    x = 364,153,530.98/20,842.59
  6. Step 6: Final answer
    x = 17,471.61

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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.