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Finding the Fourth Proportional to 289.11, 398.96 and 158.09

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Solution

The fourth proportional to 289.11, 398.96 and 158.09 is: 218.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.11 : 398.96 = 158.09 : x
  2. Step 2: Convert to fraction form
    289.11/398.96 = 158.09/x
  3. Step 3: Cross multiply
    289.11x = 398.96 × 158.09
  4. Step 4: Simplify right side
    289.11x = 63,072.19
  5. Step 5: Solve for x
    x = 63,072.19/289.11
  6. Step 6: Final answer
    x = 218.16

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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.