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Finding the Fourth Proportional to 1,338.64, 1,847.10 and 779.14

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Solution

The fourth proportional to 1,338.64, 1,847.10 and 779.14 is: 1,075.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.64 : 1,847.10 = 779.14 : x
  2. Step 2: Convert to fraction form
    1,338.64/1,847.10 = 779.14/x
  3. Step 3: Cross multiply
    1,338.64x = 1,847.10 × 779.14
  4. Step 4: Simplify right side
    1,338.64x = 1,439,149.49
  5. Step 5: Solve for x
    x = 1,439,149.49/1,338.64
  6. Step 6: Final answer
    x = 1,075.08

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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.