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Finding the Fourth Proportional to 987.94, 1,481.91 and 410.81

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Solution

The fourth proportional to 987.94, 1,481.91 and 410.81 is: 616.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.94 : 1,481.91 = 410.81 : x
  2. Step 2: Convert to fraction form
    987.94/1,481.91 = 410.81/x
  3. Step 3: Cross multiply
    987.94x = 1,481.91 × 410.81
  4. Step 4: Simplify right side
    987.94x = 608,787.15
  5. Step 5: Solve for x
    x = 608,787.15/987.94
  6. Step 6: Final answer
    x = 616.22

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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.