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Finding the Fourth Proportional to 84,080.62, 126,117.28 and 20,899.40

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Solution

The fourth proportional to 84,080.62, 126,117.28 and 20,899.40 is: 31,348.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,080.62 : 126,117.28 = 20,899.40 : x
  2. Step 2: Convert to fraction form
    84,080.62/126,117.28 = 20,899.40/x
  3. Step 3: Cross multiply
    84,080.62x = 126,117.28 × 20,899.40
  4. Step 4: Simplify right side
    84,080.62x = 2,635,775,823.05
  5. Step 5: Solve for x
    x = 2,635,775,823.05/84,080.62
  6. Step 6: Final answer
    x = 31,348.20

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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.