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Finding the Fourth Proportional to 70.38, 105.57 and 43.31

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Solution

The fourth proportional to 70.38, 105.57 and 43.31 is: 64.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.38 : 105.57 = 43.31 : x
  2. Step 2: Convert to fraction form
    70.38/105.57 = 43.31/x
  3. Step 3: Cross multiply
    70.38x = 105.57 × 43.31
  4. Step 4: Simplify right side
    70.38x = 4,572.50
  5. Step 5: Solve for x
    x = 4,572.50/70.38
  6. Step 6: Final answer
    x = 64.97

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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.