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Finding the Fourth Proportional to 862.52, 1,188.68 and 613.86

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Solution

The fourth proportional to 862.52, 1,188.68 and 613.86 is: 845.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.52 : 1,188.68 = 613.86 : x
  2. Step 2: Convert to fraction form
    862.52/1,188.68 = 613.86/x
  3. Step 3: Cross multiply
    862.52x = 1,188.68 × 613.86
  4. Step 4: Simplify right side
    862.52x = 729,683.10
  5. Step 5: Solve for x
    x = 729,683.10/862.52
  6. Step 6: Final answer
    x = 845.99

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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.