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Finding the Fourth Proportional to 866.89, 1,299.66 and 379.54

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Solution

The fourth proportional to 866.89, 1,299.66 and 379.54 is: 569.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.89 : 1,299.66 = 379.54 : x
  2. Step 2: Convert to fraction form
    866.89/1,299.66 = 379.54/x
  3. Step 3: Cross multiply
    866.89x = 1,299.66 × 379.54
  4. Step 4: Simplify right side
    866.89x = 493,272.96
  5. Step 5: Solve for x
    x = 493,272.96/866.89
  6. Step 6: Final answer
    x = 569.01

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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.