Home / 1,081.13-1,621.19-618.79

Finding the Fourth Proportional to 1,081.13, 1,621.19 and 618.79

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Solution

The fourth proportional to 1,081.13, 1,621.19 and 618.79 is: 927.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.13 : 1,621.19 = 618.79 : x
  2. Step 2: Convert to fraction form
    1,081.13/1,621.19 = 618.79/x
  3. Step 3: Cross multiply
    1,081.13x = 1,621.19 × 618.79
  4. Step 4: Simplify right side
    1,081.13x = 1,003,174.95
  5. Step 5: Solve for x
    x = 1,003,174.95/1,081.13
  6. Step 6: Final answer
    x = 927.89

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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.