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Finding the Fourth Proportional to 863.65, 1,191.82 and 470.68

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Solution

The fourth proportional to 863.65, 1,191.82 and 470.68 is: 649.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.65 : 1,191.82 = 470.68 : x
  2. Step 2: Convert to fraction form
    863.65/1,191.82 = 470.68/x
  3. Step 3: Cross multiply
    863.65x = 1,191.82 × 470.68
  4. Step 4: Simplify right side
    863.65x = 560,965.84
  5. Step 5: Solve for x
    x = 560,965.84/863.65
  6. Step 6: Final answer
    x = 649.53

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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.