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Finding the Fourth Proportional to 613.86, 919.62 and 394.20

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Solution

The fourth proportional to 613.86, 919.62 and 394.20 is: 590.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.86 : 919.62 = 394.20 : x
  2. Step 2: Convert to fraction form
    613.86/919.62 = 394.20/x
  3. Step 3: Cross multiply
    613.86x = 919.62 × 394.20
  4. Step 4: Simplify right side
    613.86x = 362,514.20
  5. Step 5: Solve for x
    x = 362,514.20/613.86
  6. Step 6: Final answer
    x = 590.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.