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Finding the Fourth Proportional to 1,222.45, 1,833.95 and 400.79

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Solution

The fourth proportional to 1,222.45, 1,833.95 and 400.79 is: 601.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.45 : 1,833.95 = 400.79 : x
  2. Step 2: Convert to fraction form
    1,222.45/1,833.95 = 400.79/x
  3. Step 3: Cross multiply
    1,222.45x = 1,833.95 × 400.79
  4. Step 4: Simplify right side
    1,222.45x = 735,028.82
  5. Step 5: Solve for x
    x = 735,028.82/1,222.45
  6. Step 6: Final answer
    x = 601.28

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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.