Home / 20,979.89-31,469.91-8,500.15

Finding the Fourth Proportional to 20,979.89, 31,469.91 and 8,500.15

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Solution

The fourth proportional to 20,979.89, 31,469.91 and 8,500.15 is: 12,750.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.89 : 31,469.91 = 8,500.15 : x
  2. Step 2: Convert to fraction form
    20,979.89/31,469.91 = 8,500.15/x
  3. Step 3: Cross multiply
    20,979.89x = 31,469.91 × 8,500.15
  4. Step 4: Simplify right side
    20,979.89x = 267,498,955.49
  5. Step 5: Solve for x
    x = 267,498,955.49/20,979.89
  6. Step 6: Final answer
    x = 12,750.26

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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.