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Finding the Fourth Proportional to 153.67, 230.39 and 76.67

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Solution

The fourth proportional to 153.67, 230.39 and 76.67 is: 114.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.67 : 230.39 = 76.67 : x
  2. Step 2: Convert to fraction form
    153.67/230.39 = 76.67/x
  3. Step 3: Cross multiply
    153.67x = 230.39 × 76.67
  4. Step 4: Simplify right side
    153.67x = 17,664.70
  5. Step 5: Solve for x
    x = 17,664.70/153.67
  6. Step 6: Final answer
    x = 114.95

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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.