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Finding the Fourth Proportional to 20,641.92, 28,486.08 and 12,145.92

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Solution

The fourth proportional to 20,641.92, 28,486.08 and 12,145.92 is: 16,761.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.92 : 28,486.08 = 12,145.92 : x
  2. Step 2: Convert to fraction form
    20,641.92/28,486.08 = 12,145.92/x
  3. Step 3: Cross multiply
    20,641.92x = 28,486.08 × 12,145.92
  4. Step 4: Simplify right side
    20,641.92x = 345,989,648.79
  5. Step 5: Solve for x
    x = 345,989,648.79/20,641.92
  6. Step 6: Final answer
    x = 16,761.51

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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.