Home / 1,081.14-1,491.75-639.11

Finding the Fourth Proportional to 1,081.14, 1,491.75 and 639.11

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Solution

The fourth proportional to 1,081.14, 1,491.75 and 639.11 is: 881.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.14 : 1,491.75 = 639.11 : x
  2. Step 2: Convert to fraction form
    1,081.14/1,491.75 = 639.11/x
  3. Step 3: Cross multiply
    1,081.14x = 1,491.75 × 639.11
  4. Step 4: Simplify right side
    1,081.14x = 953,388.61
  5. Step 5: Solve for x
    x = 953,388.61/1,081.14
  6. Step 6: Final answer
    x = 881.84

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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.