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Finding the Fourth Proportional to 316.75, 474.75 and 121.62

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Solution

The fourth proportional to 316.75, 474.75 and 121.62 is: 182.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.75 : 474.75 = 121.62 : x
  2. Step 2: Convert to fraction form
    316.75/474.75 = 121.62/x
  3. Step 3: Cross multiply
    316.75x = 474.75 × 121.62
  4. Step 4: Simplify right side
    316.75x = 57,739.10
  5. Step 5: Solve for x
    x = 57,739.10/316.75
  6. Step 6: Final answer
    x = 182.29

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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.