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Finding the Fourth Proportional to 20,691.86, 28,549.86 and 12,194.46

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Solution

The fourth proportional to 20,691.86, 28,549.86 and 12,194.46 is: 16,825.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.86 : 28,549.86 = 12,194.46 : x
  2. Step 2: Convert to fraction form
    20,691.86/28,549.86 = 12,194.46/x
  3. Step 3: Cross multiply
    20,691.86x = 28,549.86 × 12,194.46
  4. Step 4: Simplify right side
    20,691.86x = 348,150,125.78
  5. Step 5: Solve for x
    x = 348,150,125.78/20,691.86
  6. Step 6: Final answer
    x = 16,825.46

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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.