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Finding the Fourth Proportional to 316.82, 438.12 and 270.86

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Solution

The fourth proportional to 316.82, 438.12 and 270.86 is: 374.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.82 : 438.12 = 270.86 : x
  2. Step 2: Convert to fraction form
    316.82/438.12 = 270.86/x
  3. Step 3: Cross multiply
    316.82x = 438.12 × 270.86
  4. Step 4: Simplify right side
    316.82x = 118,669.18
  5. Step 5: Solve for x
    x = 118,669.18/316.82
  6. Step 6: Final answer
    x = 374.56

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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.