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Finding the Fourth Proportional to 643.59, 964.43 and 550.49

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Solution

The fourth proportional to 643.59, 964.43 and 550.49 is: 824.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.59 : 964.43 = 550.49 : x
  2. Step 2: Convert to fraction form
    643.59/964.43 = 550.49/x
  3. Step 3: Cross multiply
    643.59x = 964.43 × 550.49
  4. Step 4: Simplify right side
    643.59x = 530,908.04
  5. Step 5: Solve for x
    x = 530,908.04/643.59
  6. Step 6: Final answer
    x = 824.92

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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.