Home / 1,079.85-1,619.90-386.59

Finding the Fourth Proportional to 1,079.85, 1,619.90 and 386.59

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Solution

The fourth proportional to 1,079.85, 1,619.90 and 386.59 is: 579.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.85 : 1,619.90 = 386.59 : x
  2. Step 2: Convert to fraction form
    1,079.85/1,619.90 = 386.59/x
  3. Step 3: Cross multiply
    1,079.85x = 1,619.90 × 386.59
  4. Step 4: Simplify right side
    1,079.85x = 626,233.09
  5. Step 5: Solve for x
    x = 626,233.09/1,079.85
  6. Step 6: Final answer
    x = 579.93

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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.