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Finding the Fourth Proportional to 803.38, 1,205.16 and 255.42

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Solution

The fourth proportional to 803.38, 1,205.16 and 255.42 is: 383.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.38 : 1,205.16 = 255.42 : x
  2. Step 2: Convert to fraction form
    803.38/1,205.16 = 255.42/x
  3. Step 3: Cross multiply
    803.38x = 1,205.16 × 255.42
  4. Step 4: Simplify right side
    803.38x = 307,821.97
  5. Step 5: Solve for x
    x = 307,821.97/803.38
  6. Step 6: Final answer
    x = 383.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.