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Finding the Fourth Proportional to 803.31, 1,205.07 and 255.54

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Solution

The fourth proportional to 803.31, 1,205.07 and 255.54 is: 383.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.31 : 1,205.07 = 255.54 : x
  2. Step 2: Convert to fraction form
    803.31/1,205.07 = 255.54/x
  3. Step 3: Cross multiply
    803.31x = 1,205.07 × 255.54
  4. Step 4: Simplify right side
    803.31x = 307,943.59
  5. Step 5: Solve for x
    x = 307,943.59/803.31
  6. Step 6: Final answer
    x = 383.34

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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.