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Finding the Fourth Proportional to 68.45, 102.11 and 61.57

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Solution

The fourth proportional to 68.45, 102.11 and 61.57 is: 91.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.45 : 102.11 = 61.57 : x
  2. Step 2: Convert to fraction form
    68.45/102.11 = 61.57/x
  3. Step 3: Cross multiply
    68.45x = 102.11 × 61.57
  4. Step 4: Simplify right side
    68.45x = 6,286.40
  5. Step 5: Solve for x
    x = 6,286.40/68.45
  6. Step 6: Final answer
    x = 91.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.