Home / 20,747.12-28,630.68-11,315.12

Finding the Fourth Proportional to 20,747.12, 28,630.68 and 11,315.12

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Solution

The fourth proportional to 20,747.12, 28,630.68 and 11,315.12 is: 15,614.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.12 : 28,630.68 = 11,315.12 : x
  2. Step 2: Convert to fraction form
    20,747.12/28,630.68 = 11,315.12/x
  3. Step 3: Cross multiply
    20,747.12x = 28,630.68 × 11,315.12
  4. Step 4: Simplify right side
    20,747.12x = 323,959,579.88
  5. Step 5: Solve for x
    x = 323,959,579.88/20,747.12
  6. Step 6: Final answer
    x = 15,614.68

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Double scale
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Similar ratio
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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.