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Finding the Fourth Proportional to 811.20, 1,118.64 and 793.32

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Solution

The fourth proportional to 811.20, 1,118.64 and 793.32 is: 1,093.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.20 : 1,118.64 = 793.32 : x
  2. Step 2: Convert to fraction form
    811.20/1,118.64 = 793.32/x
  3. Step 3: Cross multiply
    811.20x = 1,118.64 × 793.32
  4. Step 4: Simplify right side
    811.20x = 887,439.48
  5. Step 5: Solve for x
    x = 887,439.48/811.20
  6. Step 6: Final answer
    x = 1,093.98

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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.