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Finding the Fourth Proportional to 863.78, 1,192 and 470.80

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Solution

The fourth proportional to 863.78, 1,192 and 470.80 is: 649.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.78 : 1,192 = 470.80 : x
  2. Step 2: Convert to fraction form
    863.78/1,192 = 470.80/x
  3. Step 3: Cross multiply
    863.78x = 1,192 × 470.80
  4. Step 4: Simplify right side
    863.78x = 561,193.60
  5. Step 5: Solve for x
    x = 561,193.60/863.78
  6. Step 6: Final answer
    x = 649.70

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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.