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Finding the Fourth Proportional to 721.95, 1,082.88 and 412.83

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Solution

The fourth proportional to 721.95, 1,082.88 and 412.83 is: 619.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.95 : 1,082.88 = 412.83 : x
  2. Step 2: Convert to fraction form
    721.95/1,082.88 = 412.83/x
  3. Step 3: Cross multiply
    721.95x = 1,082.88 × 412.83
  4. Step 4: Simplify right side
    721.95x = 447,045.35
  5. Step 5: Solve for x
    x = 447,045.35/721.95
  6. Step 6: Final answer
    x = 619.22

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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.