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Finding the Fourth Proportional to 99.69, 137.63 and 79.98

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Solution

The fourth proportional to 99.69, 137.63 and 79.98 is: 110.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.69 : 137.63 = 79.98 : x
  2. Step 2: Convert to fraction form
    99.69/137.63 = 79.98/x
  3. Step 3: Cross multiply
    99.69x = 137.63 × 79.98
  4. Step 4: Simplify right side
    99.69x = 11,007.65
  5. Step 5: Solve for x
    x = 11,007.65/99.69
  6. Step 6: Final answer
    x = 110.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.