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Finding the Fourth Proportional to 722.39, 1,083.65 and 311.55

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Solution

The fourth proportional to 722.39, 1,083.65 and 311.55 is: 467.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.39 : 1,083.65 = 311.55 : x
  2. Step 2: Convert to fraction form
    722.39/1,083.65 = 311.55/x
  3. Step 3: Cross multiply
    722.39x = 1,083.65 × 311.55
  4. Step 4: Simplify right side
    722.39x = 337,609.60
  5. Step 5: Solve for x
    x = 337,609.60/722.39
  6. Step 6: Final answer
    x = 467.35

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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.