Home / 20,689.20-30,861.72-18,696.24

Finding the Fourth Proportional to 20,689.20, 30,861.72 and 18,696.24

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Solution

The fourth proportional to 20,689.20, 30,861.72 and 18,696.24 is: 27,888.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.20 : 30,861.72 = 18,696.24 : x
  2. Step 2: Convert to fraction form
    20,689.20/30,861.72 = 18,696.24/x
  3. Step 3: Cross multiply
    20,689.20x = 30,861.72 × 18,696.24
  4. Step 4: Simplify right side
    20,689.20x = 576,998,123.93
  5. Step 5: Solve for x
    x = 576,998,123.93/20,689.20
  6. Step 6: Final answer
    x = 27,888.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.