Home / 1,222.15-1,833.28-389.29

Finding the Fourth Proportional to 1,222.15, 1,833.28 and 389.29

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Solution

The fourth proportional to 1,222.15, 1,833.28 and 389.29 is: 583.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.15 : 1,833.28 = 389.29 : x
  2. Step 2: Convert to fraction form
    1,222.15/1,833.28 = 389.29/x
  3. Step 3: Cross multiply
    1,222.15x = 1,833.28 × 389.29
  4. Step 4: Simplify right side
    1,222.15x = 713,675.62
  5. Step 5: Solve for x
    x = 713,675.62/1,222.15
  6. Step 6: Final answer
    x = 583.95

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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.