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Finding the Fourth Proportional to 621.55, 863.36 and 611.62

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Solution

The fourth proportional to 621.55, 863.36 and 611.62 is: 849.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.55 : 863.36 = 611.62 : x
  2. Step 2: Convert to fraction form
    621.55/863.36 = 611.62/x
  3. Step 3: Cross multiply
    621.55x = 863.36 × 611.62
  4. Step 4: Simplify right side
    621.55x = 528,048.24
  5. Step 5: Solve for x
    x = 528,048.24/621.55
  6. Step 6: Final answer
    x = 849.57

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.