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Finding the Fourth Proportional to 271.80, 407.61 and 76.75

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Solution

The fourth proportional to 271.80, 407.61 and 76.75 is: 115.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.80 : 407.61 = 76.75 : x
  2. Step 2: Convert to fraction form
    271.80/407.61 = 76.75/x
  3. Step 3: Cross multiply
    271.80x = 407.61 × 76.75
  4. Step 4: Simplify right side
    271.80x = 31,283.05
  5. Step 5: Solve for x
    x = 31,283.05/271.80
  6. Step 6: Final answer
    x = 115.10

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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.