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Finding the Fourth Proportional to 803.78, 1,205.72 and 478.44

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Solution

The fourth proportional to 803.78, 1,205.72 and 478.44 is: 717.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.78 : 1,205.72 = 478.44 : x
  2. Step 2: Convert to fraction form
    803.78/1,205.72 = 478.44/x
  3. Step 3: Cross multiply
    803.78x = 1,205.72 × 478.44
  4. Step 4: Simplify right side
    803.78x = 576,864.68
  5. Step 5: Solve for x
    x = 576,864.68/803.78
  6. Step 6: Final answer
    x = 717.69

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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.