Home / 1,081.12-1,491.78-609.01

Finding the Fourth Proportional to 1,081.12, 1,491.78 and 609.01

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Solution

The fourth proportional to 1,081.12, 1,491.78 and 609.01 is: 840.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.12 : 1,491.78 = 609.01 : x
  2. Step 2: Convert to fraction form
    1,081.12/1,491.78 = 609.01/x
  3. Step 3: Cross multiply
    1,081.12x = 1,491.78 × 609.01
  4. Step 4: Simplify right side
    1,081.12x = 908,508.94
  5. Step 5: Solve for x
    x = 908,508.94/1,081.12
  6. Step 6: Final answer
    x = 840.34

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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.