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Finding the Fourth Proportional to 315.92, 434.86 and 274.31

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Solution

The fourth proportional to 315.92, 434.86 and 274.31 is: 377.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.92 : 434.86 = 274.31 : x
  2. Step 2: Convert to fraction form
    315.92/434.86 = 274.31/x
  3. Step 3: Cross multiply
    315.92x = 434.86 × 274.31
  4. Step 4: Simplify right side
    315.92x = 119,286.45
  5. Step 5: Solve for x
    x = 119,286.45/315.92
  6. Step 6: Final answer
    x = 377.58

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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.