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Finding the Fourth Proportional to 635.68, 877.20 and 355.91

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Solution

The fourth proportional to 635.68, 877.20 and 355.91 is: 491.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.68 : 877.20 = 355.91 : x
  2. Step 2: Convert to fraction form
    635.68/877.20 = 355.91/x
  3. Step 3: Cross multiply
    635.68x = 877.20 × 355.91
  4. Step 4: Simplify right side
    635.68x = 312,201.49
  5. Step 5: Solve for x
    x = 312,201.49/635.68
  6. Step 6: Final answer
    x = 491.13

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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.