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Finding the Fourth Proportional to 375.39, 561.71 and 221.39

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Solution

The fourth proportional to 375.39, 561.71 and 221.39 is: 331.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.39 : 561.71 = 221.39 : x
  2. Step 2: Convert to fraction form
    375.39/561.71 = 221.39/x
  3. Step 3: Cross multiply
    375.39x = 561.71 × 221.39
  4. Step 4: Simplify right side
    375.39x = 124,356.98
  5. Step 5: Solve for x
    x = 124,356.98/375.39
  6. Step 6: Final answer
    x = 331.27

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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.