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Finding the Fourth Proportional to 316.79, 436.89 and 243.28

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Solution

The fourth proportional to 316.79, 436.89 and 243.28 is: 335.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.79 : 436.89 = 243.28 : x
  2. Step 2: Convert to fraction form
    316.79/436.89 = 243.28/x
  3. Step 3: Cross multiply
    316.79x = 436.89 × 243.28
  4. Step 4: Simplify right side
    316.79x = 106,286.60
  5. Step 5: Solve for x
    x = 106,286.60/316.79
  6. Step 6: Final answer
    x = 335.51

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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.