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Finding the Fourth Proportional to 1,105.30, 1,655.79 and 519.54

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Solution

The fourth proportional to 1,105.30, 1,655.79 and 519.54 is: 778.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.30 : 1,655.79 = 519.54 : x
  2. Step 2: Convert to fraction form
    1,105.30/1,655.79 = 519.54/x
  3. Step 3: Cross multiply
    1,105.30x = 1,655.79 × 519.54
  4. Step 4: Simplify right side
    1,105.30x = 860,249.14
  5. Step 5: Solve for x
    x = 860,249.14/1,105.30
  6. Step 6: Final answer
    x = 778.29

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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.