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Finding the Fourth Proportional to 316.80, 475.00 and 154.60

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Solution

The fourth proportional to 316.80, 475.00 and 154.60 is: 231.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.80 : 475.00 = 154.60 : x
  2. Step 2: Convert to fraction form
    316.80/475.00 = 154.60/x
  3. Step 3: Cross multiply
    316.80x = 475.00 × 154.60
  4. Step 4: Simplify right side
    316.80x = 73,433.43
  5. Step 5: Solve for x
    x = 73,433.43/316.80
  6. Step 6: Final answer
    x = 231.80

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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.