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Finding the Fourth Proportional to 902.78, 1,353.69 and 317.70

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Solution

The fourth proportional to 902.78, 1,353.69 and 317.70 is: 476.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.78 : 1,353.69 = 317.70 : x
  2. Step 2: Convert to fraction form
    902.78/1,353.69 = 317.70/x
  3. Step 3: Cross multiply
    902.78x = 1,353.69 × 317.70
  4. Step 4: Simplify right side
    902.78x = 430,067.31
  5. Step 5: Solve for x
    x = 430,067.31/902.78
  6. Step 6: Final answer
    x = 476.38

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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.