Home / 1,238.20-1,856.27-579.74

Finding the Fourth Proportional to 1,238.20, 1,856.27 and 579.74

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Solution

The fourth proportional to 1,238.20, 1,856.27 and 579.74 is: 869.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.20 : 1,856.27 = 579.74 : x
  2. Step 2: Convert to fraction form
    1,238.20/1,856.27 = 579.74/x
  3. Step 3: Cross multiply
    1,238.20x = 1,856.27 × 579.74
  4. Step 4: Simplify right side
    1,238.20x = 1,076,146.14
  5. Step 5: Solve for x
    x = 1,076,146.14/1,238.20
  6. Step 6: Final answer
    x = 869.12

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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.