Home / 20,987.33-31,481.08-8,507.59

Finding the Fourth Proportional to 20,987.33, 31,481.08 and 8,507.59

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Solution

The fourth proportional to 20,987.33, 31,481.08 and 8,507.59 is: 12,761.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.33 : 31,481.08 = 8,507.59 : x
  2. Step 2: Convert to fraction form
    20,987.33/31,481.08 = 8,507.59/x
  3. Step 3: Cross multiply
    20,987.33x = 31,481.08 × 8,507.59
  4. Step 4: Simplify right side
    20,987.33x = 267,828,121.40
  5. Step 5: Solve for x
    x = 267,828,121.40/20,987.33
  6. Step 6: Final answer
    x = 12,761.42

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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.