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Finding the Fourth Proportional to 289.01, 398.67 and 178.40

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Solution

The fourth proportional to 289.01, 398.67 and 178.40 is: 246.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.01 : 398.67 = 178.40 : x
  2. Step 2: Convert to fraction form
    289.01/398.67 = 178.40/x
  3. Step 3: Cross multiply
    289.01x = 398.67 × 178.40
  4. Step 4: Simplify right side
    289.01x = 71,122.73
  5. Step 5: Solve for x
    x = 71,122.73/289.01
  6. Step 6: Final answer
    x = 246.09

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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.