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Finding the Fourth Proportional to 803.52, 1,205.28 and 418.32

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Solution

The fourth proportional to 803.52, 1,205.28 and 418.32 is: 627.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.52 : 1,205.28 = 418.32 : x
  2. Step 2: Convert to fraction form
    803.52/1,205.28 = 418.32/x
  3. Step 3: Cross multiply
    803.52x = 1,205.28 × 418.32
  4. Step 4: Simplify right side
    803.52x = 504,192.73
  5. Step 5: Solve for x
    x = 504,192.73/803.52
  6. Step 6: Final answer
    x = 627.48

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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.