Home / 20,790.12-31,185.20-8,315.72

Finding the Fourth Proportional to 20,790.12, 31,185.20 and 8,315.72

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Solution

The fourth proportional to 20,790.12, 31,185.20 and 8,315.72 is: 12,473.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.12 : 31,185.20 = 8,315.72 : x
  2. Step 2: Convert to fraction form
    20,790.12/31,185.20 = 8,315.72/x
  3. Step 3: Cross multiply
    20,790.12x = 31,185.20 × 8,315.72
  4. Step 4: Simplify right side
    20,790.12x = 259,327,391.34
  5. Step 5: Solve for x
    x = 259,327,391.34/20,790.12
  6. Step 6: Final answer
    x = 12,473.59

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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.