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Finding the Fourth Proportional to 317.05, 475.45 and 187.31

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Solution

The fourth proportional to 317.05, 475.45 and 187.31 is: 280.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.05 : 475.45 = 187.31 : x
  2. Step 2: Convert to fraction form
    317.05/475.45 = 187.31/x
  3. Step 3: Cross multiply
    317.05x = 475.45 × 187.31
  4. Step 4: Simplify right side
    317.05x = 89,057.26
  5. Step 5: Solve for x
    x = 89,057.26/317.05
  6. Step 6: Final answer
    x = 280.90

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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.