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Finding the Fourth Proportional to 1,228.74, 1,842.90 and 406.92

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Solution

The fourth proportional to 1,228.74, 1,842.90 and 406.92 is: 610.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.74 : 1,842.90 = 406.92 : x
  2. Step 2: Convert to fraction form
    1,228.74/1,842.90 = 406.92/x
  3. Step 3: Cross multiply
    1,228.74x = 1,842.90 × 406.92
  4. Step 4: Simplify right side
    1,228.74x = 749,912.87
  5. Step 5: Solve for x
    x = 749,912.87/1,228.74
  6. Step 6: Final answer
    x = 610.31

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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.