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Finding the Fourth Proportional to 68.96, 102.70 and 68.57

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Solution

The fourth proportional to 68.96, 102.70 and 68.57 is: 102.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.96 : 102.70 = 68.57 : x
  2. Step 2: Convert to fraction form
    68.96/102.70 = 68.57/x
  3. Step 3: Cross multiply
    68.96x = 102.70 × 68.57
  4. Step 4: Simplify right side
    68.96x = 7,042.10
  5. Step 5: Solve for x
    x = 7,042.10/68.96
  6. Step 6: Final answer
    x = 102.11

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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.