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Finding the Fourth Proportional to 987.91, 1,481.86 and 410.79

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Solution

The fourth proportional to 987.91, 1,481.86 and 410.79 is: 616.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.91 : 1,481.86 = 410.79 : x
  2. Step 2: Convert to fraction form
    987.91/1,481.86 = 410.79/x
  3. Step 3: Cross multiply
    987.91x = 1,481.86 × 410.79
  4. Step 4: Simplify right side
    987.91x = 608,733.27
  5. Step 5: Solve for x
    x = 608,733.27/987.91
  6. Step 6: Final answer
    x = 616.18

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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.