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Finding the Fourth Proportional to 68.96, 103.28 and 55.46

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Solution

The fourth proportional to 68.96, 103.28 and 55.46 is: 83.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.96 : 103.28 = 55.46 : x
  2. Step 2: Convert to fraction form
    68.96/103.28 = 55.46/x
  3. Step 3: Cross multiply
    68.96x = 103.28 × 55.46
  4. Step 4: Simplify right side
    68.96x = 5,727.89
  5. Step 5: Solve for x
    x = 5,727.89/68.96
  6. Step 6: Final answer
    x = 83.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.