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Finding the Fourth Proportional to 644.87, 961.80 and 548.01

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Solution

The fourth proportional to 644.87, 961.80 and 548.01 is: 817.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.87 : 961.80 = 548.01 : x
  2. Step 2: Convert to fraction form
    644.87/961.80 = 548.01/x
  3. Step 3: Cross multiply
    644.87x = 961.80 × 548.01
  4. Step 4: Simplify right side
    644.87x = 527,073.96
  5. Step 5: Solve for x
    x = 527,073.96/644.87
  6. Step 6: Final answer
    x = 817.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.