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Finding the Fourth Proportional to 290.28, 434.34 and 174.78

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Solution

The fourth proportional to 290.28, 434.34 and 174.78 is: 261.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.28 : 434.34 = 174.78 : x
  2. Step 2: Convert to fraction form
    290.28/434.34 = 174.78/x
  3. Step 3: Cross multiply
    290.28x = 434.34 × 174.78
  4. Step 4: Simplify right side
    290.28x = 75,913.95
  5. Step 5: Solve for x
    x = 75,913.95/290.28
  6. Step 6: Final answer
    x = 261.52

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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.