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Finding the Fourth Proportional to 99.87, 137.73 and 84.36

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Solution

The fourth proportional to 99.87, 137.73 and 84.36 is: 116.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.87 : 137.73 = 84.36 : x
  2. Step 2: Convert to fraction form
    99.87/137.73 = 84.36/x
  3. Step 3: Cross multiply
    99.87x = 137.73 × 84.36
  4. Step 4: Simplify right side
    99.87x = 11,618.90
  5. Step 5: Solve for x
    x = 11,618.90/99.87
  6. Step 6: Final answer
    x = 116.34

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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.