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Finding the Fourth Proportional to 1,081.14, 1,620.18 and 618.30

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Solution

The fourth proportional to 1,081.14, 1,620.18 and 618.30 is: 926.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.14 : 1,620.18 = 618.30 : x
  2. Step 2: Convert to fraction form
    1,081.14/1,620.18 = 618.30/x
  3. Step 3: Cross multiply
    1,081.14x = 1,620.18 × 618.30
  4. Step 4: Simplify right side
    1,081.14x = 1,001,757.29
  5. Step 5: Solve for x
    x = 1,001,757.29/1,081.14
  6. Step 6: Final answer
    x = 926.57

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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.