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Finding the Fourth Proportional to 18,691.16, 28,041.78 and 6,213.20

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Solution

The fourth proportional to 18,691.16, 28,041.78 and 6,213.20 is: 9,321.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.16 : 28,041.78 = 6,213.20 : x
  2. Step 2: Convert to fraction form
    18,691.16/28,041.78 = 6,213.20/x
  3. Step 3: Cross multiply
    18,691.16x = 28,041.78 × 6,213.20
  4. Step 4: Simplify right side
    18,691.16x = 174,229,187.50
  5. Step 5: Solve for x
    x = 174,229,187.50/18,691.16
  6. Step 6: Final answer
    x = 9,321.48

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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.