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Finding the Fourth Proportional to 70.68, 105.89 and 40.19

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Solution

The fourth proportional to 70.68, 105.89 and 40.19 is: 60.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.68 : 105.89 = 40.19 : x
  2. Step 2: Convert to fraction form
    70.68/105.89 = 40.19/x
  3. Step 3: Cross multiply
    70.68x = 105.89 × 40.19
  4. Step 4: Simplify right side
    70.68x = 4,255.72
  5. Step 5: Solve for x
    x = 4,255.72/70.68
  6. Step 6: Final answer
    x = 60.21

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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.