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Finding the Fourth Proportional to 635.43, 876.90 and 355.66

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Solution

The fourth proportional to 635.43, 876.90 and 355.66 is: 490.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.43 : 876.90 = 355.66 : x
  2. Step 2: Convert to fraction form
    635.43/876.90 = 355.66/x
  3. Step 3: Cross multiply
    635.43x = 876.90 × 355.66
  4. Step 4: Simplify right side
    635.43x = 311,878.25
  5. Step 5: Solve for x
    x = 311,878.25/635.43
  6. Step 6: Final answer
    x = 490.81

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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.