Home / 20,989.32-31,475.78-8,506.12

Finding the Fourth Proportional to 20,989.32, 31,475.78 and 8,506.12

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Solution

The fourth proportional to 20,989.32, 31,475.78 and 8,506.12 is: 12,755.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.32 : 31,475.78 = 8,506.12 : x
  2. Step 2: Convert to fraction form
    20,989.32/31,475.78 = 8,506.12/x
  3. Step 3: Cross multiply
    20,989.32x = 31,475.78 × 8,506.12
  4. Step 4: Simplify right side
    20,989.32x = 267,736,761.77
  5. Step 5: Solve for x
    x = 267,736,761.77/20,989.32
  6. Step 6: Final answer
    x = 12,755.86

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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.