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Finding the Fourth Proportional to 421.14, 581.44 and 271.90

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Solution

The fourth proportional to 421.14, 581.44 and 271.90 is: 375.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.14 : 581.44 = 271.90 : x
  2. Step 2: Convert to fraction form
    421.14/581.44 = 271.90/x
  3. Step 3: Cross multiply
    421.14x = 581.44 × 271.90
  4. Step 4: Simplify right side
    421.14x = 158,092.42
  5. Step 5: Solve for x
    x = 158,092.42/421.14
  6. Step 6: Final answer
    x = 375.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.