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Finding the Fourth Proportional to 863.78, 1,191.99 and 470.79

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Solution

The fourth proportional to 863.78, 1,191.99 and 470.79 is: 649.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.78 : 1,191.99 = 470.79 : x
  2. Step 2: Convert to fraction form
    863.78/1,191.99 = 470.79/x
  3. Step 3: Cross multiply
    863.78x = 1,191.99 × 470.79
  4. Step 4: Simplify right side
    863.78x = 561,176.97
  5. Step 5: Solve for x
    x = 561,176.97/863.78
  6. Step 6: Final answer
    x = 649.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.