Home / 20,979.20-31,468.88-8,499.46

Finding the Fourth Proportional to 20,979.20, 31,468.88 and 8,499.46

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Solution

The fourth proportional to 20,979.20, 31,468.88 and 8,499.46 is: 12,749.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.20 : 31,468.88 = 8,499.46 : x
  2. Step 2: Convert to fraction form
    20,979.20/31,468.88 = 8,499.46/x
  3. Step 3: Cross multiply
    20,979.20x = 31,468.88 × 8,499.46
  4. Step 4: Simplify right side
    20,979.20x = 267,468,486.80
  5. Step 5: Solve for x
    x = 267,468,486.80/20,979.20
  6. Step 6: Final answer
    x = 12,749.22

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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.