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Finding the Fourth Proportional to 986.85, 1,479.82 and 293.28

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Solution

The fourth proportional to 986.85, 1,479.82 and 293.28 is: 439.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.85 : 1,479.82 = 293.28 : x
  2. Step 2: Convert to fraction form
    986.85/1,479.82 = 293.28/x
  3. Step 3: Cross multiply
    986.85x = 1,479.82 × 293.28
  4. Step 4: Simplify right side
    986.85x = 434,001.61
  5. Step 5: Solve for x
    x = 434,001.61/986.85
  6. Step 6: Final answer
    x = 439.78

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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.