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Finding the Fourth Proportional to 99.73, 138.59 and 99.33

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Solution

The fourth proportional to 99.73, 138.59 and 99.33 is: 138.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.73 : 138.59 = 99.33 : x
  2. Step 2: Convert to fraction form
    99.73/138.59 = 99.33/x
  3. Step 3: Cross multiply
    99.73x = 138.59 × 99.33
  4. Step 4: Simplify right side
    99.73x = 13,765.22
  5. Step 5: Solve for x
    x = 13,765.22/99.73
  6. Step 6: Final answer
    x = 138.02

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.