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Finding the Fourth Proportional to 84, 115.89 and 50.82

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Solution

The fourth proportional to 84, 115.89 and 50.82 is: 70.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    84 : 115.89 = 50.82 : x
  2. Step 2: Convert to fraction form
    84/115.89 = 50.82/x
  3. Step 3: Cross multiply
    84x = 115.89 × 50.82
  4. Step 4: Simplify right side
    84x = 5,889.53
  5. Step 5: Solve for x
    x = 5,889.53/84
  6. Step 6: Final answer
    x = 70.11

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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.