Home / 1,486.20-2,229.30-390.56

Finding the Fourth Proportional to 1,486.20, 2,229.30 and 390.56

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Solution

The fourth proportional to 1,486.20, 2,229.30 and 390.56 is: 585.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.20 : 2,229.30 = 390.56 : x
  2. Step 2: Convert to fraction form
    1,486.20/2,229.30 = 390.56/x
  3. Step 3: Cross multiply
    1,486.20x = 2,229.30 × 390.56
  4. Step 4: Simplify right side
    1,486.20x = 870,675.41
  5. Step 5: Solve for x
    x = 870,675.41/1,486.20
  6. Step 6: Final answer
    x = 585.84

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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.