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Finding the Fourth Proportional to 1,276, 1,761.18 and 779.05

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Solution

The fourth proportional to 1,276, 1,761.18 and 779.05 is: 1,075.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276 : 1,761.18 = 779.05 : x
  2. Step 2: Convert to fraction form
    1,276/1,761.18 = 779.05/x
  3. Step 3: Cross multiply
    1,276x = 1,761.18 × 779.05
  4. Step 4: Simplify right side
    1,276x = 1,372,047.28
  5. Step 5: Solve for x
    x = 1,372,047.28/1,276
  6. Step 6: Final answer
    x = 1,075.27

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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.