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Finding the Fourth Proportional to 613.07, 845.91 and 391.62

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Solution

The fourth proportional to 613.07, 845.91 and 391.62 is: 540.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.07 : 845.91 = 391.62 : x
  2. Step 2: Convert to fraction form
    613.07/845.91 = 391.62/x
  3. Step 3: Cross multiply
    613.07x = 845.91 × 391.62
  4. Step 4: Simplify right side
    613.07x = 331,275.27
  5. Step 5: Solve for x
    x = 331,275.27/613.07
  6. Step 6: Final answer
    x = 540.35

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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.