Home / 1,081.15-1,491.77-639.18

Finding the Fourth Proportional to 1,081.15, 1,491.77 and 639.18

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Solution

The fourth proportional to 1,081.15, 1,491.77 and 639.18 is: 881.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.15 : 1,491.77 = 639.18 : x
  2. Step 2: Convert to fraction form
    1,081.15/1,491.77 = 639.18/x
  3. Step 3: Cross multiply
    1,081.15x = 1,491.77 × 639.18
  4. Step 4: Simplify right side
    1,081.15x = 953,511.15
  5. Step 5: Solve for x
    x = 953,511.15/1,081.15
  6. Step 6: Final answer
    x = 881.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.