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Finding the Fourth Proportional to 68.98, 95.15 and 55.18

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Solution

The fourth proportional to 68.98, 95.15 and 55.18 is: 76.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.98 : 95.15 = 55.18 : x
  2. Step 2: Convert to fraction form
    68.98/95.15 = 55.18/x
  3. Step 3: Cross multiply
    68.98x = 95.15 × 55.18
  4. Step 4: Simplify right side
    68.98x = 5,250.38
  5. Step 5: Solve for x
    x = 5,250.38/68.98
  6. Step 6: Final answer
    x = 76.11

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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.