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Finding the Fourth Proportional to 490.34, 734.81 and 258.75

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Solution

The fourth proportional to 490.34, 734.81 and 258.75 is: 387.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.34 : 734.81 = 258.75 : x
  2. Step 2: Convert to fraction form
    490.34/734.81 = 258.75/x
  3. Step 3: Cross multiply
    490.34x = 734.81 × 258.75
  4. Step 4: Simplify right side
    490.34x = 190,132.09
  5. Step 5: Solve for x
    x = 190,132.09/490.34
  6. Step 6: Final answer
    x = 387.76

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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.