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Finding the Fourth Proportional to 642.78, 963.93 and 277.54

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Solution

The fourth proportional to 642.78, 963.93 and 277.54 is: 416.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.78 : 963.93 = 277.54 : x
  2. Step 2: Convert to fraction form
    642.78/963.93 = 277.54/x
  3. Step 3: Cross multiply
    642.78x = 963.93 × 277.54
  4. Step 4: Simplify right side
    642.78x = 267,529.13
  5. Step 5: Solve for x
    x = 267,529.13/642.78
  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.