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Finding the Fourth Proportional to 70.16, 104.82 and 68.87

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Solution

The fourth proportional to 70.16, 104.82 and 68.87 is: 102.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.16 : 104.82 = 68.87 : x
  2. Step 2: Convert to fraction form
    70.16/104.82 = 68.87/x
  3. Step 3: Cross multiply
    70.16x = 104.82 × 68.87
  4. Step 4: Simplify right side
    70.16x = 7,218.43
  5. Step 5: Solve for x
    x = 7,218.43/70.16
  6. Step 6: Final answer
    x = 102.89

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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.