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Finding the Fourth Proportional to 289.71, 398.85 and 250.89

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Solution

The fourth proportional to 289.71, 398.85 and 250.89 is: 345.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.71 : 398.85 = 250.89 : x
  2. Step 2: Convert to fraction form
    289.71/398.85 = 250.89/x
  3. Step 3: Cross multiply
    289.71x = 398.85 × 250.89
  4. Step 4: Simplify right side
    289.71x = 100,067.48
  5. Step 5: Solve for x
    x = 100,067.48/289.71
  6. Step 6: Final answer
    x = 345.41

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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.