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Finding the Fourth Proportional to 616.91, 850.64 and 395.60

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Solution

The fourth proportional to 616.91, 850.64 and 395.60 is: 545.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.91 : 850.64 = 395.60 : x
  2. Step 2: Convert to fraction form
    616.91/850.64 = 395.60/x
  3. Step 3: Cross multiply
    616.91x = 850.64 × 395.60
  4. Step 4: Simplify right side
    616.91x = 336,506.95
  5. Step 5: Solve for x
    x = 336,506.95/616.91
  6. Step 6: Final answer
    x = 545.48

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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.