Home / 1,272.81-1,909.27-579.86

Finding the Fourth Proportional to 1,272.81, 1,909.27 and 579.86

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Solution

The fourth proportional to 1,272.81, 1,909.27 and 579.86 is: 869.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.81 : 1,909.27 = 579.86 : x
  2. Step 2: Convert to fraction form
    1,272.81/1,909.27 = 579.86/x
  3. Step 3: Cross multiply
    1,272.81x = 1,909.27 × 579.86
  4. Step 4: Simplify right side
    1,272.81x = 1,107,107.64
  5. Step 5: Solve for x
    x = 1,107,107.64/1,272.81
  6. Step 6: Final answer
    x = 869.81

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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.