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Finding the Fourth Proportional to 145.44, 218 and 81.36

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Solution

The fourth proportional to 145.44, 218 and 81.36 is: 121.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.44 : 218 = 81.36 : x
  2. Step 2: Convert to fraction form
    145.44/218 = 81.36/x
  3. Step 3: Cross multiply
    145.44x = 218 × 81.36
  4. Step 4: Simplify right side
    145.44x = 17,736.48
  5. Step 5: Solve for x
    x = 17,736.48/145.44
  6. Step 6: Final answer
    x = 121.95

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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.