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Finding the Fourth Proportional to 643.62, 885.83 and 548.85

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Solution

The fourth proportional to 643.62, 885.83 and 548.85 is: 755.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.62 : 885.83 = 548.85 : x
  2. Step 2: Convert to fraction form
    643.62/885.83 = 548.85/x
  3. Step 3: Cross multiply
    643.62x = 885.83 × 548.85
  4. Step 4: Simplify right side
    643.62x = 486,185.05
  5. Step 5: Solve for x
    x = 486,185.05/643.62
  6. Step 6: Final answer
    x = 755.39

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1.5x scale

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.