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Finding the Fourth Proportional to 1,108.13, 1,662.80 and 531

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Solution

The fourth proportional to 1,108.13, 1,662.80 and 531 is: 796.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.13 : 1,662.80 = 531 : x
  2. Step 2: Convert to fraction form
    1,108.13/1,662.80 = 531/x
  3. Step 3: Cross multiply
    1,108.13x = 1,662.80 × 531
  4. Step 4: Simplify right side
    1,108.13x = 882,944.15
  5. Step 5: Solve for x
    x = 882,944.15/1,108.13
  6. Step 6: Final answer
    x = 796.79

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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.