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Finding the Fourth Proportional to 1,276.62, 1,761.40 and 779.23

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Solution

The fourth proportional to 1,276.62, 1,761.40 and 779.23 is: 1,075.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.62 : 1,761.40 = 779.23 : x
  2. Step 2: Convert to fraction form
    1,276.62/1,761.40 = 779.23/x
  3. Step 3: Cross multiply
    1,276.62x = 1,761.40 × 779.23
  4. Step 4: Simplify right side
    1,276.62x = 1,372,535.72
  5. Step 5: Solve for x
    x = 1,372,535.72/1,276.62
  6. Step 6: Final answer
    x = 1,075.13

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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.