Home / 20,883.57-28,824.89-12,921.30

Finding the Fourth Proportional to 20,883.57, 28,824.89 and 12,921.30

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Solution

The fourth proportional to 20,883.57, 28,824.89 and 12,921.30 is: 17,834.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,883.57 : 28,824.89 = 12,921.30 : x
  2. Step 2: Convert to fraction form
    20,883.57/28,824.89 = 12,921.30/x
  3. Step 3: Cross multiply
    20,883.57x = 28,824.89 × 12,921.30
  4. Step 4: Simplify right side
    20,883.57x = 372,454,941.82
  5. Step 5: Solve for x
    x = 372,454,941.82/20,883.57
  6. Step 6: Final answer
    x = 17,834.83

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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.