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Finding the Fourth Proportional to 613.20, 845.03 and 391.76

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Solution

The fourth proportional to 613.20, 845.03 and 391.76 is: 539.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.20 : 845.03 = 391.76 : x
  2. Step 2: Convert to fraction form
    613.20/845.03 = 391.76/x
  3. Step 3: Cross multiply
    613.20x = 845.03 × 391.76
  4. Step 4: Simplify right side
    613.20x = 331,051.25
  5. Step 5: Solve for x
    x = 331,051.25/613.20
  6. Step 6: Final answer
    x = 539.88

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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.