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Finding the Fourth Proportional to 613.37, 921.92 and 398.32

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Solution

The fourth proportional to 613.37, 921.92 and 398.32 is: 598.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.37 : 921.92 = 398.32 : x
  2. Step 2: Convert to fraction form
    613.37/921.92 = 398.32/x
  3. Step 3: Cross multiply
    613.37x = 921.92 × 398.32
  4. Step 4: Simplify right side
    613.37x = 367,214.88
  5. Step 5: Solve for x
    x = 367,214.88/613.37
  6. Step 6: Final answer
    x = 598.68

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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.