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Finding the Fourth Proportional to 68.13, 93.82 and 55.78

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Solution

The fourth proportional to 68.13, 93.82 and 55.78 is: 76.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.13 : 93.82 = 55.78 : x
  2. Step 2: Convert to fraction form
    68.13/93.82 = 55.78/x
  3. Step 3: Cross multiply
    68.13x = 93.82 × 55.78
  4. Step 4: Simplify right side
    68.13x = 5,233.28
  5. Step 5: Solve for x
    x = 5,233.28/68.13
  6. Step 6: Final answer
    x = 76.81

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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.