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Finding the Fourth Proportional to 986.92, 1,479.88 and 439.28

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Solution

The fourth proportional to 986.92, 1,479.88 and 439.28 is: 658.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.92 : 1,479.88 = 439.28 : x
  2. Step 2: Convert to fraction form
    986.92/1,479.88 = 439.28/x
  3. Step 3: Cross multiply
    986.92x = 1,479.88 × 439.28
  4. Step 4: Simplify right side
    986.92x = 650,081.69
  5. Step 5: Solve for x
    x = 650,081.69/986.92
  6. Step 6: Final answer
    x = 658.70

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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.