Home / 1,039.20-1,558.96-389.92

Finding the Fourth Proportional to 1,039.20, 1,558.96 and 389.92

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Solution

The fourth proportional to 1,039.20, 1,558.96 and 389.92 is: 584.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.20 : 1,558.96 = 389.92 : x
  2. Step 2: Convert to fraction form
    1,039.20/1,558.96 = 389.92/x
  3. Step 3: Cross multiply
    1,039.20x = 1,558.96 × 389.92
  4. Step 4: Simplify right side
    1,039.20x = 607,869.68
  5. Step 5: Solve for x
    x = 607,869.68/1,039.20
  6. Step 6: Final answer
    x = 584.94

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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.