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Finding the Fourth Proportional to 491.92, 738.34 and 261.08

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Solution

The fourth proportional to 491.92, 738.34 and 261.08 is: 391.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.92 : 738.34 = 261.08 : x
  2. Step 2: Convert to fraction form
    491.92/738.34 = 261.08/x
  3. Step 3: Cross multiply
    491.92x = 738.34 × 261.08
  4. Step 4: Simplify right side
    491.92x = 192,765.81
  5. Step 5: Solve for x
    x = 192,765.81/491.92
  6. Step 6: Final answer
    x = 391.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.