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Finding the Fourth Proportional to 289.26, 398.88 and 189.70

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Solution

The fourth proportional to 289.26, 398.88 and 189.70 is: 261.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.26 : 398.88 = 189.70 : x
  2. Step 2: Convert to fraction form
    289.26/398.88 = 189.70/x
  3. Step 3: Cross multiply
    289.26x = 398.88 × 189.70
  4. Step 4: Simplify right side
    289.26x = 75,667.54
  5. Step 5: Solve for x
    x = 75,667.54/289.26
  6. Step 6: Final answer
    x = 261.59

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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.