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Finding the Fourth Proportional to 1,369, 1,889.56 and 779.88

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Solution

The fourth proportional to 1,369, 1,889.56 and 779.88 is: 1,076.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369 : 1,889.56 = 779.88 : x
  2. Step 2: Convert to fraction form
    1,369/1,889.56 = 779.88/x
  3. Step 3: Cross multiply
    1,369x = 1,889.56 × 779.88
  4. Step 4: Simplify right side
    1,369x = 1,473,630.05
  5. Step 5: Solve for x
    x = 1,473,630.05/1,369
  6. Step 6: Final answer
    x = 1,076.43

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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.