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Finding the Fourth Proportional to 987.72, 1,481.91 and 439.84

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Solution

The fourth proportional to 987.72, 1,481.91 and 439.84 is: 659.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.72 : 1,481.91 = 439.84 : x
  2. Step 2: Convert to fraction form
    987.72/1,481.91 = 439.84/x
  3. Step 3: Cross multiply
    987.72x = 1,481.91 × 439.84
  4. Step 4: Simplify right side
    987.72x = 651,803.29
  5. Step 5: Solve for x
    x = 651,803.29/987.72
  6. Step 6: Final answer
    x = 659.91

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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.