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Finding the Fourth Proportional to 158.69, 238.03 and 139.67

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Solution

The fourth proportional to 158.69, 238.03 and 139.67 is: 209.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.69 : 238.03 = 139.67 : x
  2. Step 2: Convert to fraction form
    158.69/238.03 = 139.67/x
  3. Step 3: Cross multiply
    158.69x = 238.03 × 139.67
  4. Step 4: Simplify right side
    158.69x = 33,245.65
  5. Step 5: Solve for x
    x = 33,245.65/158.69
  6. Step 6: Final answer
    x = 209.50

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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.