Home / 20,840.43-28,760.72-12,456.75

Finding the Fourth Proportional to 20,840.43, 28,760.72 and 12,456.75

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Solution

The fourth proportional to 20,840.43, 28,760.72 and 12,456.75 is: 17,190.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.43 : 28,760.72 = 12,456.75 : x
  2. Step 2: Convert to fraction form
    20,840.43/28,760.72 = 12,456.75/x
  3. Step 3: Cross multiply
    20,840.43x = 28,760.72 × 12,456.75
  4. Step 4: Simplify right side
    20,840.43x = 358,265,036.58
  5. Step 5: Solve for x
    x = 358,265,036.58/20,840.43
  6. Step 6: Final answer
    x = 17,190.87

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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.