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Finding the Fourth Proportional to 158.69, 238.98 and 138.65

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Solution

The fourth proportional to 158.69, 238.98 and 138.65 is: 208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.69 : 238.98 = 138.65 : x
  2. Step 2: Convert to fraction form
    158.69/238.98 = 138.65/x
  3. Step 3: Cross multiply
    158.69x = 238.98 × 138.65
  4. Step 4: Simplify right side
    158.69x = 33,133.38
  5. Step 5: Solve for x
    x = 33,133.38/158.69
  6. Step 6: Final answer
    x = 208.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.