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Finding the Fourth Proportional to 158.12, 217.78 and 137.42

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Solution

The fourth proportional to 158.12, 217.78 and 137.42 is: 189.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.12 : 217.78 = 137.42 : x
  2. Step 2: Convert to fraction form
    158.12/217.78 = 137.42/x
  3. Step 3: Cross multiply
    158.12x = 217.78 × 137.42
  4. Step 4: Simplify right side
    158.12x = 29,925.90
  5. Step 5: Solve for x
    x = 29,925.90/158.12
  6. Step 6: Final answer
    x = 189.27

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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.