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Finding the Fourth Proportional to 863.72, 1,191.90 and 470.75

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Solution

The fourth proportional to 863.72, 1,191.90 and 470.75 is: 649.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.72 : 1,191.90 = 470.75 : x
  2. Step 2: Convert to fraction form
    863.72/1,191.90 = 470.75/x
  3. Step 3: Cross multiply
    863.72x = 1,191.90 × 470.75
  4. Step 4: Simplify right side
    863.72x = 561,087.20
  5. Step 5: Solve for x
    x = 561,087.20/863.72
  6. Step 6: Final answer
    x = 649.62

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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.