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Finding the Fourth Proportional to 803.24, 1,205.05 and 255.48

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Solution

The fourth proportional to 803.24, 1,205.05 and 255.48 is: 383.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.24 : 1,205.05 = 255.48 : x
  2. Step 2: Convert to fraction form
    803.24/1,205.05 = 255.48/x
  3. Step 3: Cross multiply
    803.24x = 1,205.05 × 255.48
  4. Step 4: Simplify right side
    803.24x = 307,866.17
  5. Step 5: Solve for x
    x = 307,866.17/803.24
  6. Step 6: Final answer
    x = 383.28

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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.