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Finding the Fourth Proportional to 316.67, 434.22 and 285.46

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Solution

The fourth proportional to 316.67, 434.22 and 285.46 is: 391.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.67 : 434.22 = 285.46 : x
  2. Step 2: Convert to fraction form
    316.67/434.22 = 285.46/x
  3. Step 3: Cross multiply
    316.67x = 434.22 × 285.46
  4. Step 4: Simplify right side
    316.67x = 123,951.01
  5. Step 5: Solve for x
    x = 123,951.01/316.67
  6. Step 6: Final answer
    x = 391.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.