Home / 1,272.20-1,908.47-579.04

Finding the Fourth Proportional to 1,272.20, 1,908.47 and 579.04

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Solution

The fourth proportional to 1,272.20, 1,908.47 and 579.04 is: 868.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.20 : 1,908.47 = 579.04 : x
  2. Step 2: Convert to fraction form
    1,272.20/1,908.47 = 579.04/x
  3. Step 3: Cross multiply
    1,272.20x = 1,908.47 × 579.04
  4. Step 4: Simplify right side
    1,272.20x = 1,105,077.15
  5. Step 5: Solve for x
    x = 1,105,077.15/1,272.20
  6. Step 6: Final answer
    x = 868.64

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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.