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Finding the Fourth Proportional to 153.62, 211.79 and 109.43

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Solution

The fourth proportional to 153.62, 211.79 and 109.43 is: 150.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.62 : 211.79 = 109.43 : x
  2. Step 2: Convert to fraction form
    153.62/211.79 = 109.43/x
  3. Step 3: Cross multiply
    153.62x = 211.79 × 109.43
  4. Step 4: Simplify right side
    153.62x = 23,175.29
  5. Step 5: Solve for x
    x = 23,175.29/153.62
  6. Step 6: Final answer
    x = 150.86

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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.