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Finding the Fourth Proportional to 803.54, 1,108.11 and 685.58

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Solution

The fourth proportional to 803.54, 1,108.11 and 685.58 is: 945.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.54 : 1,108.11 = 685.58 : x
  2. Step 2: Convert to fraction form
    803.54/1,108.11 = 685.58/x
  3. Step 3: Cross multiply
    803.54x = 1,108.11 × 685.58
  4. Step 4: Simplify right side
    803.54x = 759,698.05
  5. Step 5: Solve for x
    x = 759,698.05/803.54
  6. Step 6: Final answer
    x = 945.44

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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.