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Finding the Fourth Proportional to 316.25, 474 and 121.12

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Solution

The fourth proportional to 316.25, 474 and 121.12 is: 181.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.25 : 474 = 121.12 : x
  2. Step 2: Convert to fraction form
    316.25/474 = 121.12/x
  3. Step 3: Cross multiply
    316.25x = 474 × 121.12
  4. Step 4: Simplify right side
    316.25x = 57,409.70
  5. Step 5: Solve for x
    x = 57,409.70/316.25
  6. Step 6: Final answer
    x = 181.54

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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.