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Finding the Fourth Proportional to 643.08, 963.90 and 277.68

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Solution

The fourth proportional to 643.08, 963.90 and 277.68 is: 416.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.08 : 963.90 = 277.68 : x
  2. Step 2: Convert to fraction form
    643.08/963.90 = 277.68/x
  3. Step 3: Cross multiply
    643.08x = 963.90 × 277.68
  4. Step 4: Simplify right side
    643.08x = 267,655.75
  5. Step 5: Solve for x
    x = 267,655.75/643.08
  6. Step 6: Final answer
    x = 416.21

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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.