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Finding the Fourth Proportional to 811.56, 1,118.34 and 531.48

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Solution

The fourth proportional to 811.56, 1,118.34 and 531.48 is: 732.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.56 : 1,118.34 = 531.48 : x
  2. Step 2: Convert to fraction form
    811.56/1,118.34 = 531.48/x
  3. Step 3: Cross multiply
    811.56x = 1,118.34 × 531.48
  4. Step 4: Simplify right side
    811.56x = 594,375.34
  5. Step 5: Solve for x
    x = 594,375.34/811.56
  6. Step 6: Final answer
    x = 732.39

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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.