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Finding the Fourth Proportional to 70.46, 105.74 and 43.42

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Solution

The fourth proportional to 70.46, 105.74 and 43.42 is: 65.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.46 : 105.74 = 43.42 : x
  2. Step 2: Convert to fraction form
    70.46/105.74 = 43.42/x
  3. Step 3: Cross multiply
    70.46x = 105.74 × 43.42
  4. Step 4: Simplify right side
    70.46x = 4,591.23
  5. Step 5: Solve for x
    x = 4,591.23/70.46
  6. Step 6: Final answer
    x = 65.16

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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.