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Finding the Fourth Proportional to 635.40, 876.87 and 355.65

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Solution

The fourth proportional to 635.40, 876.87 and 355.65 is: 490.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.40 : 876.87 = 355.65 : x
  2. Step 2: Convert to fraction form
    635.40/876.87 = 355.65/x
  3. Step 3: Cross multiply
    635.40x = 876.87 × 355.65
  4. Step 4: Simplify right side
    635.40x = 311,854.43
  5. Step 5: Solve for x
    x = 311,854.43/635.40
  6. Step 6: Final answer
    x = 490.80

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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.