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Finding the Fourth Proportional to 635.09, 876.45 and 355.31

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Solution

The fourth proportional to 635.09, 876.45 and 355.31 is: 490.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.09 : 876.45 = 355.31 : x
  2. Step 2: Convert to fraction form
    635.09/876.45 = 355.31/x
  3. Step 3: Cross multiply
    635.09x = 876.45 × 355.31
  4. Step 4: Simplify right side
    635.09x = 311,411.45
  5. Step 5: Solve for x
    x = 311,411.45/635.09
  6. Step 6: Final answer
    x = 490.34

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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.