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Finding the Fourth Proportional to 20,854.88, 28,780.20 and 11,902.20

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Solution

The fourth proportional to 20,854.88, 28,780.20 and 11,902.20 is: 16,425.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,854.88 : 28,780.20 = 11,902.20 : x
  2. Step 2: Convert to fraction form
    20,854.88/28,780.20 = 11,902.20/x
  3. Step 3: Cross multiply
    20,854.88x = 28,780.20 × 11,902.20
  4. Step 4: Simplify right side
    20,854.88x = 342,547,696.44
  5. Step 5: Solve for x
    x = 342,547,696.44/20,854.88
  6. Step 6: Final answer
    x = 16,425.31

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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.