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Finding the Fourth Proportional to 643.18, 964.74 and 447.61

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Solution

The fourth proportional to 643.18, 964.74 and 447.61 is: 671.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.18 : 964.74 = 447.61 : x
  2. Step 2: Convert to fraction form
    643.18/964.74 = 447.61/x
  3. Step 3: Cross multiply
    643.18x = 964.74 × 447.61
  4. Step 4: Simplify right side
    643.18x = 431,827.27
  5. Step 5: Solve for x
    x = 431,827.27/643.18
  6. Step 6: Final answer
    x = 671.39

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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.