Home / 20,431.71-28,187.60-12,876.03

Finding the Fourth Proportional to 20,431.71, 28,187.60 and 12,876.03

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Solution

The fourth proportional to 20,431.71, 28,187.60 and 12,876.03 is: 17,763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.71 : 28,187.60 = 12,876.03 : x
  2. Step 2: Convert to fraction form
    20,431.71/28,187.60 = 12,876.03/x
  3. Step 3: Cross multiply
    20,431.71x = 28,187.60 × 12,876.03
  4. Step 4: Simplify right side
    20,431.71x = 362,944,318.85
  5. Step 5: Solve for x
    x = 362,944,318.85/20,431.71
  6. Step 6: Final answer
    x = 17,763.78

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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.