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Finding the Fourth Proportional to 643.93, 887.95 and 550.98

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Solution

The fourth proportional to 643.93, 887.95 and 550.98 is: 759.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.93 : 887.95 = 550.98 : x
  2. Step 2: Convert to fraction form
    643.93/887.95 = 550.98/x
  3. Step 3: Cross multiply
    643.93x = 887.95 × 550.98
  4. Step 4: Simplify right side
    643.93x = 489,244.97
  5. Step 5: Solve for x
    x = 489,244.97/643.93
  6. Step 6: Final answer
    x = 759.78

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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.