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Finding the Fourth Proportional to 811.33, 1,118.89 and 531.47

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Solution

The fourth proportional to 811.33, 1,118.89 and 531.47 is: 732.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.33 : 1,118.89 = 531.47 : x
  2. Step 2: Convert to fraction form
    811.33/1,118.89 = 531.47/x
  3. Step 3: Cross multiply
    811.33x = 1,118.89 × 531.47
  4. Step 4: Simplify right side
    811.33x = 594,656.47
  5. Step 5: Solve for x
    x = 594,656.47/811.33
  6. Step 6: Final answer
    x = 732.94

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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.