Home / 20,769.12-31,155.75-8,286.21

Finding the Fourth Proportional to 20,769.12, 31,155.75 and 8,286.21

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Solution

The fourth proportional to 20,769.12, 31,155.75 and 8,286.21 is: 12,430.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,769.12 : 31,155.75 = 8,286.21 : x
  2. Step 2: Convert to fraction form
    20,769.12/31,155.75 = 8,286.21/x
  3. Step 3: Cross multiply
    20,769.12x = 31,155.75 × 8,286.21
  4. Step 4: Simplify right side
    20,769.12x = 258,163,087.21
  5. Step 5: Solve for x
    x = 258,163,087.21/20,769.12
  6. Step 6: Final answer
    x = 12,430.14

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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.