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Finding the Fourth Proportional to 1,115.78, 1,539.78 and 618.41

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Solution

The fourth proportional to 1,115.78, 1,539.78 and 618.41 is: 853.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.78 : 1,539.78 = 618.41 : x
  2. Step 2: Convert to fraction form
    1,115.78/1,539.78 = 618.41/x
  3. Step 3: Cross multiply
    1,115.78x = 1,539.78 × 618.41
  4. Step 4: Simplify right side
    1,115.78x = 952,207.65
  5. Step 5: Solve for x
    x = 952,207.65/1,115.78
  6. Step 6: Final answer
    x = 853.40

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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.