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Finding the Fourth Proportional to 635.78, 877.37 and 387.11

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Solution

The fourth proportional to 635.78, 877.37 and 387.11 is: 534.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.78 : 877.37 = 387.11 : x
  2. Step 2: Convert to fraction form
    635.78/877.37 = 387.11/x
  3. Step 3: Cross multiply
    635.78x = 877.37 × 387.11
  4. Step 4: Simplify right side
    635.78x = 339,638.96
  5. Step 5: Solve for x
    x = 339,638.96/635.78
  6. Step 6: Final answer
    x = 534.21

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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.