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Finding the Fourth Proportional to 271.99, 407.90 and 76.97

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Solution

The fourth proportional to 271.99, 407.90 and 76.97 is: 115.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.99 : 407.90 = 76.97 : x
  2. Step 2: Convert to fraction form
    271.99/407.90 = 76.97/x
  3. Step 3: Cross multiply
    271.99x = 407.90 × 76.97
  4. Step 4: Simplify right side
    271.99x = 31,397.08
  5. Step 5: Solve for x
    x = 31,397.08/271.99
  6. Step 6: Final answer
    x = 115.44

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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.