Home / 20,691.24-31,040.82-8,208.78

Finding the Fourth Proportional to 20,691.24, 31,040.82 and 8,208.78

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Solution

The fourth proportional to 20,691.24, 31,040.82 and 8,208.78 is: 12,314.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.24 : 31,040.82 = 8,208.78 : x
  2. Step 2: Convert to fraction form
    20,691.24/31,040.82 = 8,208.78/x
  3. Step 3: Cross multiply
    20,691.24x = 31,040.82 × 8,208.78
  4. Step 4: Simplify right side
    20,691.24x = 254,807,262.40
  5. Step 5: Solve for x
    x = 254,807,262.40/20,691.24
  6. Step 6: Final answer
    x = 12,314.74

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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.