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Finding the Fourth Proportional to 1,369, 1,889.20 and 779.42

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Solution

The fourth proportional to 1,369, 1,889.20 and 779.42 is: 1,075.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369 : 1,889.20 = 779.42 : x
  2. Step 2: Convert to fraction form
    1,369/1,889.20 = 779.42/x
  3. Step 3: Cross multiply
    1,369x = 1,889.20 × 779.42
  4. Step 4: Simplify right side
    1,369x = 1,472,480.26
  5. Step 5: Solve for x
    x = 1,472,480.26/1,369
  6. Step 6: Final answer
    x = 1,075.59

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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.