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Finding the Fourth Proportional to 987.91, 1,481.77 and 338.61

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Solution

The fourth proportional to 987.91, 1,481.77 and 338.61 is: 507.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.91 : 1,481.77 = 338.61 : x
  2. Step 2: Convert to fraction form
    987.91/1,481.77 = 338.61/x
  3. Step 3: Cross multiply
    987.91x = 1,481.77 × 338.61
  4. Step 4: Simplify right side
    987.91x = 501,742.14
  5. Step 5: Solve for x
    x = 501,742.14/987.91
  6. Step 6: Final answer
    x = 507.88

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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.