Home / 20,920.85-28,863.81-12,425.57

Finding the Fourth Proportional to 20,920.85, 28,863.81 and 12,425.57

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Solution

The fourth proportional to 20,920.85, 28,863.81 and 12,425.57 is: 17,143.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.85 : 28,863.81 = 12,425.57 : x
  2. Step 2: Convert to fraction form
    20,920.85/28,863.81 = 12,425.57/x
  3. Step 3: Cross multiply
    20,920.85x = 28,863.81 × 12,425.57
  4. Step 4: Simplify right side
    20,920.85x = 358,649,147.30
  5. Step 5: Solve for x
    x = 358,649,147.30/20,920.85
  6. Step 6: Final answer
    x = 17,143.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.