Home / 20,886.12-31,350.24-12,138.12

Finding the Fourth Proportional to 20,886.12, 31,350.24 and 12,138.12

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Solution

The fourth proportional to 20,886.12, 31,350.24 and 12,138.12 is: 18,219.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.12 : 31,350.24 = 12,138.12 : x
  2. Step 2: Convert to fraction form
    20,886.12/31,350.24 = 12,138.12/x
  3. Step 3: Cross multiply
    20,886.12x = 31,350.24 × 12,138.12
  4. Step 4: Simplify right side
    20,886.12x = 380,532,975.15
  5. Step 5: Solve for x
    x = 380,532,975.15/20,886.12
  6. Step 6: Final answer
    x = 18,219.42

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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.