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Finding the Fourth Proportional to 70.40, 105.64 and 34.31

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Solution

The fourth proportional to 70.40, 105.64 and 34.31 is: 51.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.40 : 105.64 = 34.31 : x
  2. Step 2: Convert to fraction form
    70.40/105.64 = 34.31/x
  3. Step 3: Cross multiply
    70.40x = 105.64 × 34.31
  4. Step 4: Simplify right side
    70.40x = 3,624.69
  5. Step 5: Solve for x
    x = 3,624.69/70.40
  6. Step 6: Final answer
    x = 51.49

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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.