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Finding the Fourth Proportional to 20,188.90, 30,246.90 and 18,876.70

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Solution

The fourth proportional to 20,188.90, 30,246.90 and 18,876.70 is: 28,280.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,188.90 : 30,246.90 = 18,876.70 : x
  2. Step 2: Convert to fraction form
    20,188.90/30,246.90 = 18,876.70/x
  3. Step 3: Cross multiply
    20,188.90x = 30,246.90 × 18,876.70
  4. Step 4: Simplify right side
    20,188.90x = 570,961,657.23
  5. Step 5: Solve for x
    x = 570,961,657.23/20,188.90
  6. Step 6: Final answer
    x = 28,280.97

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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.