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Finding the Fourth Proportional to 783.88, 1,175.49 and 321.34

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Solution

The fourth proportional to 783.88, 1,175.49 and 321.34 is: 481.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.88 : 1,175.49 = 321.34 : x
  2. Step 2: Convert to fraction form
    783.88/1,175.49 = 321.34/x
  3. Step 3: Cross multiply
    783.88x = 1,175.49 × 321.34
  4. Step 4: Simplify right side
    783.88x = 377,731.96
  5. Step 5: Solve for x
    x = 377,731.96/783.88
  6. Step 6: Final answer
    x = 481.87

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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.