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Finding the Fourth Proportional to 1,267.88, 1,902.68 and 779.44

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Solution

The fourth proportional to 1,267.88, 1,902.68 and 779.44 is: 1,169.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.88 : 1,902.68 = 779.44 : x
  2. Step 2: Convert to fraction form
    1,267.88/1,902.68 = 779.44/x
  3. Step 3: Cross multiply
    1,267.88x = 1,902.68 × 779.44
  4. Step 4: Simplify right side
    1,267.88x = 1,483,024.90
  5. Step 5: Solve for x
    x = 1,483,024.90/1,267.88
  6. Step 6: Final answer
    x = 1,169.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.