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Finding the Fourth Proportional to 15,202.80, 20,979.90 and 8,488.41

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Solution

The fourth proportional to 15,202.80, 20,979.90 and 8,488.41 is: 11,714.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,202.80 : 20,979.90 = 8,488.41 : x
  2. Step 2: Convert to fraction form
    15,202.80/20,979.90 = 8,488.41/x
  3. Step 3: Cross multiply
    15,202.80x = 20,979.90 × 8,488.41
  4. Step 4: Simplify right side
    15,202.80x = 178,085,992.96
  5. Step 5: Solve for x
    x = 178,085,992.96/15,202.80
  6. Step 6: Final answer
    x = 11,714.03

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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.