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Finding the Fourth Proportional to 866.92, 1,300.56 and 289.78

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Solution

The fourth proportional to 866.92, 1,300.56 and 289.78 is: 434.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.92 : 1,300.56 = 289.78 : x
  2. Step 2: Convert to fraction form
    866.92/1,300.56 = 289.78/x
  3. Step 3: Cross multiply
    866.92x = 1,300.56 × 289.78
  4. Step 4: Simplify right side
    866.92x = 376,876.28
  5. Step 5: Solve for x
    x = 376,876.28/866.92
  6. Step 6: Final answer
    x = 434.73

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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.