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Finding the Fourth Proportional to 902.20, 1,353.44 and 317.28

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Solution

The fourth proportional to 902.20, 1,353.44 and 317.28 is: 475.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.20 : 1,353.44 = 317.28 : x
  2. Step 2: Convert to fraction form
    902.20/1,353.44 = 317.28/x
  3. Step 3: Cross multiply
    902.20x = 1,353.44 × 317.28
  4. Step 4: Simplify right side
    902.20x = 429,413.97
  5. Step 5: Solve for x
    x = 429,413.97/902.20
  6. Step 6: Final answer
    x = 475.96

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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.