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Finding the Fourth Proportional to 140.84, 211.32 and 128.96

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Solution

The fourth proportional to 140.84, 211.32 and 128.96 is: 193.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.84 : 211.32 = 128.96 : x
  2. Step 2: Convert to fraction form
    140.84/211.32 = 128.96/x
  3. Step 3: Cross multiply
    140.84x = 211.32 × 128.96
  4. Step 4: Simplify right side
    140.84x = 27,251.83
  5. Step 5: Solve for x
    x = 27,251.83/140.84
  6. Step 6: Final answer
    x = 193.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.