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Finding the Fourth Proportional to 1,369.17, 1,889.19 and 779.69

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Solution

The fourth proportional to 1,369.17, 1,889.19 and 779.69 is: 1,075.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.17 : 1,889.19 = 779.69 : x
  2. Step 2: Convert to fraction form
    1,369.17/1,889.19 = 779.69/x
  3. Step 3: Cross multiply
    1,369.17x = 1,889.19 × 779.69
  4. Step 4: Simplify right side
    1,369.17x = 1,472,987.27
  5. Step 5: Solve for x
    x = 1,472,987.27/1,369.17
  6. Step 6: Final answer
    x = 1,075.82

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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.