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Finding the Fourth Proportional to 79.46, 119.21 and 38.87

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Solution

The fourth proportional to 79.46, 119.21 and 38.87 is: 58.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.46 : 119.21 = 38.87 : x
  2. Step 2: Convert to fraction form
    79.46/119.21 = 38.87/x
  3. Step 3: Cross multiply
    79.46x = 119.21 × 38.87
  4. Step 4: Simplify right side
    79.46x = 4,633.69
  5. Step 5: Solve for x
    x = 4,633.69/79.46
  6. Step 6: Final answer
    x = 58.31

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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.