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Finding the Fourth Proportional to 642.54, 963.90 and 277.34

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Solution

The fourth proportional to 642.54, 963.90 and 277.34 is: 416.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.54 : 963.90 = 277.34 : x
  2. Step 2: Convert to fraction form
    642.54/963.90 = 277.34/x
  3. Step 3: Cross multiply
    642.54x = 963.90 × 277.34
  4. Step 4: Simplify right side
    642.54x = 267,328.03
  5. Step 5: Solve for x
    x = 267,328.03/642.54
  6. Step 6: Final answer
    x = 416.05

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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.