Home / 20,986.33-31,479.58-8,506.59

Finding the Fourth Proportional to 20,986.33, 31,479.58 and 8,506.59

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Solution

The fourth proportional to 20,986.33, 31,479.58 and 8,506.59 is: 12,759.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.33 : 31,479.58 = 8,506.59 : x
  2. Step 2: Convert to fraction form
    20,986.33/31,479.58 = 8,506.59/x
  3. Step 3: Cross multiply
    20,986.33x = 31,479.58 × 8,506.59
  4. Step 4: Simplify right side
    20,986.33x = 267,783,880.43
  5. Step 5: Solve for x
    x = 267,783,880.43/20,986.33
  6. Step 6: Final answer
    x = 12,759.92

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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.