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Finding the Fourth Proportional to 811.61, 1,120.40 and 531.86

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Solution

The fourth proportional to 811.61, 1,120.40 and 531.86 is: 734.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.61 : 1,120.40 = 531.86 : x
  2. Step 2: Convert to fraction form
    811.61/1,120.40 = 531.86/x
  3. Step 3: Cross multiply
    811.61x = 1,120.40 × 531.86
  4. Step 4: Simplify right side
    811.61x = 595,887.68
  5. Step 5: Solve for x
    x = 595,887.68/811.61
  6. Step 6: Final answer
    x = 734.21

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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.