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Finding the Fourth Proportional to 316.78, 438.09 and 302.28

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Solution

The fourth proportional to 316.78, 438.09 and 302.28 is: 418.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.78 : 438.09 = 302.28 : x
  2. Step 2: Convert to fraction form
    316.78/438.09 = 302.28/x
  3. Step 3: Cross multiply
    316.78x = 438.09 × 302.28
  4. Step 4: Simplify right side
    316.78x = 132,425.85
  5. Step 5: Solve for x
    x = 132,425.85/316.78
  6. Step 6: Final answer
    x = 418.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.