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Finding the Fourth Proportional to 79.84, 119.71 and 39.30

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Solution

The fourth proportional to 79.84, 119.71 and 39.30 is: 58.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.84 : 119.71 = 39.30 : x
  2. Step 2: Convert to fraction form
    79.84/119.71 = 39.30/x
  3. Step 3: Cross multiply
    79.84x = 119.71 × 39.30
  4. Step 4: Simplify right side
    79.84x = 4,704.60
  5. Step 5: Solve for x
    x = 4,704.60/79.84
  6. Step 6: Final answer
    x = 58.93

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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.