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Finding the Fourth Proportional to 68.45, 102.33 and 66.83

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Solution

The fourth proportional to 68.45, 102.33 and 66.83 is: 99.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.45 : 102.33 = 66.83 : x
  2. Step 2: Convert to fraction form
    68.45/102.33 = 66.83/x
  3. Step 3: Cross multiply
    68.45x = 102.33 × 66.83
  4. Step 4: Simplify right side
    68.45x = 6,838.20
  5. Step 5: Solve for x
    x = 6,838.20/68.45
  6. Step 6: Final answer
    x = 99.91

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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.