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Finding the Fourth Proportional to 722.78, 1,083.39 and 312.11

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Solution

The fourth proportional to 722.78, 1,083.39 and 312.11 is: 467.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.78 : 1,083.39 = 312.11 : x
  2. Step 2: Convert to fraction form
    722.78/1,083.39 = 312.11/x
  3. Step 3: Cross multiply
    722.78x = 1,083.39 × 312.11
  4. Step 4: Simplify right side
    722.78x = 338,130.27
  5. Step 5: Solve for x
    x = 338,130.27/722.78
  6. Step 6: Final answer
    x = 467.82

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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.