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Finding the Fourth Proportional to 28,132.60, 42,198.90 and 18,218.20

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Solution

The fourth proportional to 28,132.60, 42,198.90 and 18,218.20 is: 27,327.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,132.60 : 42,198.90 = 18,218.20 : x
  2. Step 2: Convert to fraction form
    28,132.60/42,198.90 = 18,218.20/x
  3. Step 3: Cross multiply
    28,132.60x = 42,198.90 × 18,218.20
  4. Step 4: Simplify right side
    28,132.60x = 768,787,999.98
  5. Step 5: Solve for x
    x = 768,787,999.98/28,132.60
  6. Step 6: Final answer
    x = 27,327.30

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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.