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Finding the Fourth Proportional to 271.68, 405.56 and 239.36

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Solution

The fourth proportional to 271.68, 405.56 and 239.36 is: 357.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.68 : 405.56 = 239.36 : x
  2. Step 2: Convert to fraction form
    271.68/405.56 = 239.36/x
  3. Step 3: Cross multiply
    271.68x = 405.56 × 239.36
  4. Step 4: Simplify right side
    271.68x = 97,074.84
  5. Step 5: Solve for x
    x = 97,074.84/271.68
  6. Step 6: Final answer
    x = 357.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.