Home / 20,921.85-28,865.19-12,426.57

Finding the Fourth Proportional to 20,921.85, 28,865.19 and 12,426.57

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Solution

The fourth proportional to 20,921.85, 28,865.19 and 12,426.57 is: 17,144.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.85 : 28,865.19 = 12,426.57 : x
  2. Step 2: Convert to fraction form
    20,921.85/28,865.19 = 12,426.57/x
  3. Step 3: Cross multiply
    20,921.85x = 28,865.19 × 12,426.57
  4. Step 4: Simplify right side
    20,921.85x = 358,695,304.10
  5. Step 5: Solve for x
    x = 358,695,304.10/20,921.85
  6. Step 6: Final answer
    x = 17,144.53

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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.