Home / 20,680.10-31,010.55-8,987.30

Finding the Fourth Proportional to 20,680.10, 31,010.55 and 8,987.30

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Solution

The fourth proportional to 20,680.10, 31,010.55 and 8,987.30 is: 13,476.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.10 : 31,010.55 = 8,987.30 : x
  2. Step 2: Convert to fraction form
    20,680.10/31,010.55 = 8,987.30/x
  3. Step 3: Cross multiply
    20,680.10x = 31,010.55 × 8,987.30
  4. Step 4: Simplify right side
    20,680.10x = 278,701,116.02
  5. Step 5: Solve for x
    x = 278,701,116.02/20,680.10
  6. Step 6: Final answer
    x = 13,476.78

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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.