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Finding the Fourth Proportional to 70.45, 105.69 and 38.38

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Solution

The fourth proportional to 70.45, 105.69 and 38.38 is: 57.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.45 : 105.69 = 38.38 : x
  2. Step 2: Convert to fraction form
    70.45/105.69 = 38.38/x
  3. Step 3: Cross multiply
    70.45x = 105.69 × 38.38
  4. Step 4: Simplify right side
    70.45x = 4,056.38
  5. Step 5: Solve for x
    x = 4,056.38/70.45
  6. Step 6: Final answer
    x = 57.58

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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.