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Finding the Fourth Proportional to 18,879.39, 28,319.18 and 5,731.88

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Solution

The fourth proportional to 18,879.39, 28,319.18 and 5,731.88 is: 8,597.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.39 : 28,319.18 = 5,731.88 : x
  2. Step 2: Convert to fraction form
    18,879.39/28,319.18 = 5,731.88/x
  3. Step 3: Cross multiply
    18,879.39x = 28,319.18 × 5,731.88
  4. Step 4: Simplify right side
    18,879.39x = 162,321,971.20
  5. Step 5: Solve for x
    x = 162,321,971.20/18,879.39
  6. Step 6: Final answer
    x = 8,597.84

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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.