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Finding the Fourth Proportional to 635.70, 877.36 and 387.09

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Solution

The fourth proportional to 635.70, 877.36 and 387.09 is: 534.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.70 : 877.36 = 387.09 : x
  2. Step 2: Convert to fraction form
    635.70/877.36 = 387.09/x
  3. Step 3: Cross multiply
    635.70x = 877.36 × 387.09
  4. Step 4: Simplify right side
    635.70x = 339,617.28
  5. Step 5: Solve for x
    x = 339,617.28/635.70
  6. Step 6: Final answer
    x = 534.24

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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.