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Finding the Fourth Proportional to 613.91, 847.18 and 351.91

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Solution

The fourth proportional to 613.91, 847.18 and 351.91 is: 485.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.91 : 847.18 = 351.91 : x
  2. Step 2: Convert to fraction form
    613.91/847.18 = 351.91/x
  3. Step 3: Cross multiply
    613.91x = 847.18 × 351.91
  4. Step 4: Simplify right side
    613.91x = 298,131.11
  5. Step 5: Solve for x
    x = 298,131.11/613.91
  6. Step 6: Final answer
    x = 485.63

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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.