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Finding the Fourth Proportional to 70.94, 105.76 and 70.68

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Solution

The fourth proportional to 70.94, 105.76 and 70.68 is: 105.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.94 : 105.76 = 70.68 : x
  2. Step 2: Convert to fraction form
    70.94/105.76 = 70.68/x
  3. Step 3: Cross multiply
    70.94x = 105.76 × 70.68
  4. Step 4: Simplify right side
    70.94x = 7,475.12
  5. Step 5: Solve for x
    x = 7,475.12/70.94
  6. Step 6: Final answer
    x = 105.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.