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Finding the Fourth Proportional to 635.99, 877.66 and 356.21

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Solution

The fourth proportional to 635.99, 877.66 and 356.21 is: 491.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.99 : 877.66 = 356.21 : x
  2. Step 2: Convert to fraction form
    635.99/877.66 = 356.21/x
  3. Step 3: Cross multiply
    635.99x = 877.66 × 356.21
  4. Step 4: Simplify right side
    635.99x = 312,635.22
  5. Step 5: Solve for x
    x = 312,635.22/635.99
  6. Step 6: Final answer
    x = 491.58

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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.