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Finding the Fourth Proportional to 902.56, 1,353.99 and 317.72

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Solution

The fourth proportional to 902.56, 1,353.99 and 317.72 is: 476.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.56 : 1,353.99 = 317.72 : x
  2. Step 2: Convert to fraction form
    902.56/1,353.99 = 317.72/x
  3. Step 3: Cross multiply
    902.56x = 1,353.99 × 317.72
  4. Step 4: Simplify right side
    902.56x = 430,189.70
  5. Step 5: Solve for x
    x = 430,189.70/902.56
  6. Step 6: Final answer
    x = 476.63

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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.