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Finding the Fourth Proportional to 451.71, 621.56 and 439.61

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Solution

The fourth proportional to 451.71, 621.56 and 439.61 is: 604.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.71 : 621.56 = 439.61 : x
  2. Step 2: Convert to fraction form
    451.71/621.56 = 439.61/x
  3. Step 3: Cross multiply
    451.71x = 621.56 × 439.61
  4. Step 4: Simplify right side
    451.71x = 273,238.69
  5. Step 5: Solve for x
    x = 273,238.69/451.71
  6. Step 6: Final answer
    x = 604.90

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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.