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Finding the Fourth Proportional to 70.31, 105.49 and 29.19

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Solution

The fourth proportional to 70.31, 105.49 and 29.19 is: 43.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.31 : 105.49 = 29.19 : x
  2. Step 2: Convert to fraction form
    70.31/105.49 = 29.19/x
  3. Step 3: Cross multiply
    70.31x = 105.49 × 29.19
  4. Step 4: Simplify right side
    70.31x = 3,079.69
  5. Step 5: Solve for x
    x = 3,079.69/70.31
  6. Step 6: Final answer
    x = 43.80

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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.