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Finding the Fourth Proportional to 20,141.70, 30,212.55 and 13,143.30

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Solution

The fourth proportional to 20,141.70, 30,212.55 and 13,143.30 is: 19,714.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,141.70 : 30,212.55 = 13,143.30 : x
  2. Step 2: Convert to fraction form
    20,141.70/30,212.55 = 13,143.30/x
  3. Step 3: Cross multiply
    20,141.70x = 30,212.55 × 13,143.30
  4. Step 4: Simplify right side
    20,141.70x = 397,092,608.42
  5. Step 5: Solve for x
    x = 397,092,608.42/20,141.70
  6. Step 6: Final answer
    x = 19,714.95

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Similar ratio
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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.