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Finding the Fourth Proportional to 722.52, 1,082.19 and 640.50

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Solution

The fourth proportional to 722.52, 1,082.19 and 640.50 is: 959.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.52 : 1,082.19 = 640.50 : x
  2. Step 2: Convert to fraction form
    722.52/1,082.19 = 640.50/x
  3. Step 3: Cross multiply
    722.52x = 1,082.19 × 640.50
  4. Step 4: Simplify right side
    722.52x = 693,142.70
  5. Step 5: Solve for x
    x = 693,142.70/722.52
  6. Step 6: Final answer
    x = 959.34

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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.