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Finding the Fourth Proportional to 405.11, 557.70 and 349.53

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Solution

The fourth proportional to 405.11, 557.70 and 349.53 is: 481.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.11 : 557.70 = 349.53 : x
  2. Step 2: Convert to fraction form
    405.11/557.70 = 349.53/x
  3. Step 3: Cross multiply
    405.11x = 557.70 × 349.53
  4. Step 4: Simplify right side
    405.11x = 194,932.88
  5. Step 5: Solve for x
    x = 194,932.88/405.11
  6. Step 6: Final answer
    x = 481.19

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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.