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Finding the Fourth Proportional to 866.62, 1,299.93 and 379.61

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Solution

The fourth proportional to 866.62, 1,299.93 and 379.61 is: 569.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.62 : 1,299.93 = 379.61 : x
  2. Step 2: Convert to fraction form
    866.62/1,299.93 = 379.61/x
  3. Step 3: Cross multiply
    866.62x = 1,299.93 × 379.61
  4. Step 4: Simplify right side
    866.62x = 493,466.43
  5. Step 5: Solve for x
    x = 493,466.43/866.62
  6. Step 6: Final answer
    x = 569.42

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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.