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Finding the Fourth Proportional to 902.78, 1,353.20 and 439.52

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Solution

The fourth proportional to 902.78, 1,353.20 and 439.52 is: 658.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.78 : 1,353.20 = 439.52 : x
  2. Step 2: Convert to fraction form
    902.78/1,353.20 = 439.52/x
  3. Step 3: Cross multiply
    902.78x = 1,353.20 × 439.52
  4. Step 4: Simplify right side
    902.78x = 594,758.46
  5. Step 5: Solve for x
    x = 594,758.46/902.78
  6. Step 6: Final answer
    x = 658.81

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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.