Home / 13,947.12-20,920.68-4,086.40

Finding the Fourth Proportional to 13,947.12, 20,920.68 and 4,086.40

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Solution

The fourth proportional to 13,947.12, 20,920.68 and 4,086.40 is: 6,129.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,947.12 : 20,920.68 = 4,086.40 : x
  2. Step 2: Convert to fraction form
    13,947.12/20,920.68 = 4,086.40/x
  3. Step 3: Cross multiply
    13,947.12x = 20,920.68 × 4,086.40
  4. Step 4: Simplify right side
    13,947.12x = 85,490,146.82
  5. Step 5: Solve for x
    x = 85,490,146.82/13,947.12
  6. Step 6: Final answer
    x = 6,129.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.