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Finding the Fourth Proportional to 70.81, 106.21 and 50.46

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Solution

The fourth proportional to 70.81, 106.21 and 50.46 is: 75.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.81 : 106.21 = 50.46 : x
  2. Step 2: Convert to fraction form
    70.81/106.21 = 50.46/x
  3. Step 3: Cross multiply
    70.81x = 106.21 × 50.46
  4. Step 4: Simplify right side
    70.81x = 5,359.36
  5. Step 5: Solve for x
    x = 5,359.36/70.81
  6. Step 6: Final answer
    x = 75.69

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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.