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Finding the Fourth Proportional to 1,227.40, 1,841.08 and 405.56

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Solution

The fourth proportional to 1,227.40, 1,841.08 and 405.56 is: 608.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.40 : 1,841.08 = 405.56 : x
  2. Step 2: Convert to fraction form
    1,227.40/1,841.08 = 405.56/x
  3. Step 3: Cross multiply
    1,227.40x = 1,841.08 × 405.56
  4. Step 4: Simplify right side
    1,227.40x = 746,662.40
  5. Step 5: Solve for x
    x = 746,662.40/1,227.40
  6. Step 6: Final answer
    x = 608.33

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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.