Home / 20,987.32-31,472.78-8,504.12

Finding the Fourth Proportional to 20,987.32, 31,472.78 and 8,504.12

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Solution

The fourth proportional to 20,987.32, 31,472.78 and 8,504.12 is: 12,752.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.32 : 31,472.78 = 8,504.12 : x
  2. Step 2: Convert to fraction form
    20,987.32/31,472.78 = 8,504.12/x
  3. Step 3: Cross multiply
    20,987.32x = 31,472.78 × 8,504.12
  4. Step 4: Simplify right side
    20,987.32x = 267,648,297.85
  5. Step 5: Solve for x
    x = 267,648,297.85/20,987.32
  6. Step 6: Final answer
    x = 12,752.86

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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.