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Finding the Fourth Proportional to 722.63, 1,084.17 and 311.78

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Solution

The fourth proportional to 722.63, 1,084.17 and 311.78 is: 467.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.63 : 1,084.17 = 311.78 : x
  2. Step 2: Convert to fraction form
    722.63/1,084.17 = 311.78/x
  3. Step 3: Cross multiply
    722.63x = 1,084.17 × 311.78
  4. Step 4: Simplify right side
    722.63x = 338,026.40
  5. Step 5: Solve for x
    x = 338,026.40/722.63
  6. Step 6: Final answer
    x = 467.77

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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.