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Finding the Fourth Proportional to 451.14, 621.18 and 398.49

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Solution

The fourth proportional to 451.14, 621.18 and 398.49 is: 548.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.14 : 621.18 = 398.49 : x
  2. Step 2: Convert to fraction form
    451.14/621.18 = 398.49/x
  3. Step 3: Cross multiply
    451.14x = 621.18 × 398.49
  4. Step 4: Simplify right side
    451.14x = 247,534.02
  5. Step 5: Solve for x
    x = 247,534.02/451.14
  6. Step 6: Final answer
    x = 548.69

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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.