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Finding the Fourth Proportional to 144, 216.18 and 79.92

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Solution

The fourth proportional to 144, 216.18 and 79.92 is: 119.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    144 : 216.18 = 79.92 : x
  2. Step 2: Convert to fraction form
    144/216.18 = 79.92/x
  3. Step 3: Cross multiply
    144x = 216.18 × 79.92
  4. Step 4: Simplify right side
    144x = 17,277.11
  5. Step 5: Solve for x
    x = 17,277.11/144
  6. Step 6: Final answer
    x = 119.98

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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.