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Finding the Fourth Proportional to 20,215.70, 30,323.55 and 18,401.30

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Solution

The fourth proportional to 20,215.70, 30,323.55 and 18,401.30 is: 27,601.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,215.70 : 30,323.55 = 18,401.30 : x
  2. Step 2: Convert to fraction form
    20,215.70/30,323.55 = 18,401.30/x
  3. Step 3: Cross multiply
    20,215.70x = 30,323.55 × 18,401.30
  4. Step 4: Simplify right side
    20,215.70x = 557,992,740.62
  5. Step 5: Solve for x
    x = 557,992,740.62/20,215.70
  6. Step 6: Final answer
    x = 27,601.95

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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.