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Finding the Fourth Proportional to 316.75, 475.40 and 154.55

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Solution

The fourth proportional to 316.75, 475.40 and 154.55 is: 231.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.75 : 475.40 = 154.55 : x
  2. Step 2: Convert to fraction form
    316.75/475.40 = 154.55/x
  3. Step 3: Cross multiply
    316.75x = 475.40 × 154.55
  4. Step 4: Simplify right side
    316.75x = 73,473.07
  5. Step 5: Solve for x
    x = 73,473.07/316.75
  6. Step 6: Final answer
    x = 231.96

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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.