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Finding the Fourth Proportional to 70.62, 105.01 and 68.45

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Solution

The fourth proportional to 70.62, 105.01 and 68.45 is: 101.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.62 : 105.01 = 68.45 : x
  2. Step 2: Convert to fraction form
    70.62/105.01 = 68.45/x
  3. Step 3: Cross multiply
    70.62x = 105.01 × 68.45
  4. Step 4: Simplify right side
    70.62x = 7,187.93
  5. Step 5: Solve for x
    x = 7,187.93/70.62
  6. Step 6: Final answer
    x = 101.79

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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.