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Finding the Fourth Proportional to 316.90, 474.54 and 220.78

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Solution

The fourth proportional to 316.90, 474.54 and 220.78 is: 330.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.90 : 474.54 = 220.78 : x
  2. Step 2: Convert to fraction form
    316.90/474.54 = 220.78/x
  3. Step 3: Cross multiply
    316.90x = 474.54 × 220.78
  4. Step 4: Simplify right side
    316.90x = 104,768.94
  5. Step 5: Solve for x
    x = 104,768.94/316.90
  6. Step 6: Final answer
    x = 330.61

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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.