Home / 20,758.28-31,248.20-18,615

Finding the Fourth Proportional to 20,758.28, 31,248.20 and 18,615

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Solution

The fourth proportional to 20,758.28, 31,248.20 and 18,615 is: 28,021.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,758.28 : 31,248.20 = 18,615 : x
  2. Step 2: Convert to fraction form
    20,758.28/31,248.20 = 18,615/x
  3. Step 3: Cross multiply
    20,758.28x = 31,248.20 × 18,615
  4. Step 4: Simplify right side
    20,758.28x = 581,685,243
  5. Step 5: Solve for x
    x = 581,685,243/20,758.28
  6. Step 6: Final answer
    x = 28,021.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.