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Finding the Fourth Proportional to 20,920.62, 28,866.78 and 11,966.88

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Solution

The fourth proportional to 20,920.62, 28,866.78 and 11,966.88 is: 16,512.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.62 : 28,866.78 = 11,966.88 : x
  2. Step 2: Convert to fraction form
    20,920.62/28,866.78 = 11,966.88/x
  3. Step 3: Cross multiply
    20,920.62x = 28,866.78 × 11,966.88
  4. Step 4: Simplify right side
    20,920.62x = 345,445,292.25
  5. Step 5: Solve for x
    x = 345,445,292.25/20,920.62
  6. Step 6: Final answer
    x = 16,512.19

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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.