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Finding the Fourth Proportional to 722.16, 1,082.61 and 289.03

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Solution

The fourth proportional to 722.16, 1,082.61 and 289.03 is: 433.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.16 : 1,082.61 = 289.03 : x
  2. Step 2: Convert to fraction form
    722.16/1,082.61 = 289.03/x
  3. Step 3: Cross multiply
    722.16x = 1,082.61 × 289.03
  4. Step 4: Simplify right side
    722.16x = 312,906.77
  5. Step 5: Solve for x
    x = 312,906.77/722.16
  6. Step 6: Final answer
    x = 433.30

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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.