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Finding the Fourth Proportional to 892.35, 1,338.98 and 405.34

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Solution

The fourth proportional to 892.35, 1,338.98 and 405.34 is: 608.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.35 : 1,338.98 = 405.34 : x
  2. Step 2: Convert to fraction form
    892.35/1,338.98 = 405.34/x
  3. Step 3: Cross multiply
    892.35x = 1,338.98 × 405.34
  4. Step 4: Simplify right side
    892.35x = 542,736.78
  5. Step 5: Solve for x
    x = 542,736.78/892.35
  6. Step 6: Final answer
    x = 608.21

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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.