Home / 20,731.42-28,609.14-11,299.78

Finding the Fourth Proportional to 20,731.42, 28,609.14 and 11,299.78

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Solution

The fourth proportional to 20,731.42, 28,609.14 and 11,299.78 is: 15,593.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.42 : 28,609.14 = 11,299.78 : x
  2. Step 2: Convert to fraction form
    20,731.42/28,609.14 = 11,299.78/x
  3. Step 3: Cross multiply
    20,731.42x = 28,609.14 × 11,299.78
  4. Step 4: Simplify right side
    20,731.42x = 323,276,987.99
  5. Step 5: Solve for x
    x = 323,276,987.99/20,731.42
  6. Step 6: Final answer
    x = 15,593.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.