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Finding the Fourth Proportional to 68.90, 95.06 and 55.11

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Solution

The fourth proportional to 68.90, 95.06 and 55.11 is: 76.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.90 : 95.06 = 55.11 : x
  2. Step 2: Convert to fraction form
    68.90/95.06 = 55.11/x
  3. Step 3: Cross multiply
    68.90x = 95.06 × 55.11
  4. Step 4: Simplify right side
    68.90x = 5,238.41
  5. Step 5: Solve for x
    x = 5,238.41/68.90
  6. Step 6: Final answer
    x = 76.03

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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.