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Finding the Fourth Proportional to 19,920.80, 29,841.96 and 11,128.88

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Solution

The fourth proportional to 19,920.80, 29,841.96 and 11,128.88 is: 16,671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.80 : 29,841.96 = 11,128.88 : x
  2. Step 2: Convert to fraction form
    19,920.80/29,841.96 = 11,128.88/x
  3. Step 3: Cross multiply
    19,920.80x = 29,841.96 × 11,128.88
  4. Step 4: Simplify right side
    19,920.80x = 332,107,591.80
  5. Step 5: Solve for x
    x = 332,107,591.80/19,920.80
  6. Step 6: Final answer
    x = 16,671.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.