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Finding the Fourth Proportional to 99.98, 138.05 and 79.38

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Solution

The fourth proportional to 99.98, 138.05 and 79.38 is: 109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.98 : 138.05 = 79.38 : x
  2. Step 2: Convert to fraction form
    99.98/138.05 = 79.38/x
  3. Step 3: Cross multiply
    99.98x = 138.05 × 79.38
  4. Step 4: Simplify right side
    99.98x = 10,958.76
  5. Step 5: Solve for x
    x = 10,958.76/99.98
  6. Step 6: Final answer
    x = 109.60

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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.