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Finding the Fourth Proportional to 1,226.88, 1,840.31 and 405.22

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Solution

The fourth proportional to 1,226.88, 1,840.31 and 405.22 is: 607.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.88 : 1,840.31 = 405.22 : x
  2. Step 2: Convert to fraction form
    1,226.88/1,840.31 = 405.22/x
  3. Step 3: Cross multiply
    1,226.88x = 1,840.31 × 405.22
  4. Step 4: Simplify right side
    1,226.88x = 745,730.42
  5. Step 5: Solve for x
    x = 745,730.42/1,226.88
  6. Step 6: Final answer
    x = 607.83

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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.