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Finding the Fourth Proportional to 154.31, 211.74 and 140.39

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Solution

The fourth proportional to 154.31, 211.74 and 140.39 is: 192.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.31 : 211.74 = 140.39 : x
  2. Step 2: Convert to fraction form
    154.31/211.74 = 140.39/x
  3. Step 3: Cross multiply
    154.31x = 211.74 × 140.39
  4. Step 4: Simplify right side
    154.31x = 29,725.12
  5. Step 5: Solve for x
    x = 29,725.12/154.31
  6. Step 6: Final answer
    x = 192.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.