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Finding the Fourth Proportional to 68.90, 95.10 and 55.12

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Solution

The fourth proportional to 68.90, 95.10 and 55.12 is: 76.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.90 : 95.10 = 55.12 : x
  2. Step 2: Convert to fraction form
    68.90/95.10 = 55.12/x
  3. Step 3: Cross multiply
    68.90x = 95.10 × 55.12
  4. Step 4: Simplify right side
    68.90x = 5,241.91
  5. Step 5: Solve for x
    x = 5,241.91/68.90
  6. Step 6: Final answer
    x = 76.08

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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.