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Finding the Fourth Proportional to 1,331, 1,836.78 and 779

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Solution

The fourth proportional to 1,331, 1,836.78 and 779 is: 1,075.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331 : 1,836.78 = 779 : x
  2. Step 2: Convert to fraction form
    1,331/1,836.78 = 779/x
  3. Step 3: Cross multiply
    1,331x = 1,836.78 × 779
  4. Step 4: Simplify right side
    1,331x = 1,430,851.62
  5. Step 5: Solve for x
    x = 1,430,851.62/1,331
  6. Step 6: Final answer
    x = 1,075.02

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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.