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Finding the Fourth Proportional to 79.71, 119.58 and 41.21

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Solution

The fourth proportional to 79.71, 119.58 and 41.21 is: 61.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.71 : 119.58 = 41.21 : x
  2. Step 2: Convert to fraction form
    79.71/119.58 = 41.21/x
  3. Step 3: Cross multiply
    79.71x = 119.58 × 41.21
  4. Step 4: Simplify right side
    79.71x = 4,927.89
  5. Step 5: Solve for x
    x = 4,927.89/79.71
  6. Step 6: Final answer
    x = 61.82

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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.