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Finding the Fourth Proportional to 20,125.70, 30,188.55 and 18,311.30

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Solution

The fourth proportional to 20,125.70, 30,188.55 and 18,311.30 is: 27,466.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,125.70 : 30,188.55 = 18,311.30 : x
  2. Step 2: Convert to fraction form
    20,125.70/30,188.55 = 18,311.30/x
  3. Step 3: Cross multiply
    20,125.70x = 30,188.55 × 18,311.30
  4. Step 4: Simplify right side
    20,125.70x = 552,791,595.62
  5. Step 5: Solve for x
    x = 552,791,595.62/20,125.70
  6. Step 6: Final answer
    x = 27,466.95

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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.