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Finding the Fourth Proportional to 271.98, 407.95 and 79.61

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Solution

The fourth proportional to 271.98, 407.95 and 79.61 is: 119.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.98 : 407.95 = 79.61 : x
  2. Step 2: Convert to fraction form
    271.98/407.95 = 79.61/x
  3. Step 3: Cross multiply
    271.98x = 407.95 × 79.61
  4. Step 4: Simplify right side
    271.98x = 32,474.66
  5. Step 5: Solve for x
    x = 32,474.66/271.98
  6. Step 6: Final answer
    x = 119.40

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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.