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Finding the Fourth Proportional to 783.47, 1,175.21 and 321.17

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Solution

The fourth proportional to 783.47, 1,175.21 and 321.17 is: 481.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.47 : 1,175.21 = 321.17 : x
  2. Step 2: Convert to fraction form
    783.47/1,175.21 = 321.17/x
  3. Step 3: Cross multiply
    783.47x = 1,175.21 × 321.17
  4. Step 4: Simplify right side
    783.47x = 377,435.92
  5. Step 5: Solve for x
    x = 377,435.92/783.47
  6. Step 6: Final answer
    x = 481.75

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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.