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Finding the Fourth Proportional to 18,876.20, 28,311 and 7,190.12

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Solution

The fourth proportional to 18,876.20, 28,311 and 7,190.12 is: 10,783.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,876.20 : 28,311 = 7,190.12 : x
  2. Step 2: Convert to fraction form
    18,876.20/28,311 = 7,190.12/x
  3. Step 3: Cross multiply
    18,876.20x = 28,311 × 7,190.12
  4. Step 4: Simplify right side
    18,876.20x = 203,559,487.32
  5. Step 5: Solve for x
    x = 203,559,487.32/18,876.20
  6. Step 6: Final answer
    x = 10,783.92

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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.