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Finding the Fourth Proportional to 1,115.80, 1,539.78 and 618.43

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Solution

The fourth proportional to 1,115.80, 1,539.78 and 618.43 is: 853.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.80 : 1,539.78 = 618.43 : x
  2. Step 2: Convert to fraction form
    1,115.80/1,539.78 = 618.43/x
  3. Step 3: Cross multiply
    1,115.80x = 1,539.78 × 618.43
  4. Step 4: Simplify right side
    1,115.80x = 952,246.15
  5. Step 5: Solve for x
    x = 952,246.15/1,115.80
  6. Step 6: Final answer
    x = 853.42

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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.