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Finding the Fourth Proportional to 1,338.80, 1,847.49 and 779.29

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Solution

The fourth proportional to 1,338.80, 1,847.49 and 779.29 is: 1,075.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.80 : 1,847.49 = 779.29 : x
  2. Step 2: Convert to fraction form
    1,338.80/1,847.49 = 779.29/x
  3. Step 3: Cross multiply
    1,338.80x = 1,847.49 × 779.29
  4. Step 4: Simplify right side
    1,338.80x = 1,439,730.48
  5. Step 5: Solve for x
    x = 1,439,730.48/1,338.80
  6. Step 6: Final answer
    x = 1,075.39

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1.5x scale

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.