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Finding the Fourth Proportional to 70.69, 105.78 and 63.20

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Solution

The fourth proportional to 70.69, 105.78 and 63.20 is: 94.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.69 : 105.78 = 63.20 : x
  2. Step 2: Convert to fraction form
    70.69/105.78 = 63.20/x
  3. Step 3: Cross multiply
    70.69x = 105.78 × 63.20
  4. Step 4: Simplify right side
    70.69x = 6,685.30
  5. Step 5: Solve for x
    x = 6,685.30/70.69
  6. Step 6: Final answer
    x = 94.57

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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.