Home / 20,818.80-31,236.30-9,123.78

Finding the Fourth Proportional to 20,818.80, 31,236.30 and 9,123.78

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Solution

The fourth proportional to 20,818.80, 31,236.30 and 9,123.78 is: 13,689.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.80 : 31,236.30 = 9,123.78 : x
  2. Step 2: Convert to fraction form
    20,818.80/31,236.30 = 9,123.78/x
  3. Step 3: Cross multiply
    20,818.80x = 31,236.30 × 9,123.78
  4. Step 4: Simplify right side
    20,818.80x = 284,993,129.21
  5. Step 5: Solve for x
    x = 284,993,129.21/20,818.80
  6. Step 6: Final answer
    x = 13,689.22

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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.