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Finding the Fourth Proportional to 862.56, 1,189.68 and 613.62

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Solution

The fourth proportional to 862.56, 1,189.68 and 613.62 is: 846.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.56 : 1,189.68 = 613.62 : x
  2. Step 2: Convert to fraction form
    862.56/1,189.68 = 613.62/x
  3. Step 3: Cross multiply
    862.56x = 1,189.68 × 613.62
  4. Step 4: Simplify right side
    862.56x = 730,011.44
  5. Step 5: Solve for x
    x = 730,011.44/862.56
  6. Step 6: Final answer
    x = 846.33

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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.