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Finding the Fourth Proportional to 635.18, 876.49 and 355.39

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Solution

The fourth proportional to 635.18, 876.49 and 355.39 is: 490.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.18 : 876.49 = 355.39 : x
  2. Step 2: Convert to fraction form
    635.18/876.49 = 355.39/x
  3. Step 3: Cross multiply
    635.18x = 876.49 × 355.39
  4. Step 4: Simplify right side
    635.18x = 311,492.70
  5. Step 5: Solve for x
    x = 311,492.70/635.18
  6. Step 6: Final answer
    x = 490.40

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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.