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Finding the Fourth Proportional to 635.09, 876.20 and 398.93

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Solution

The fourth proportional to 635.09, 876.20 and 398.93 is: 550.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.09 : 876.20 = 398.93 : x
  2. Step 2: Convert to fraction form
    635.09/876.20 = 398.93/x
  3. Step 3: Cross multiply
    635.09x = 876.20 × 398.93
  4. Step 4: Simplify right side
    635.09x = 349,536.09
  5. Step 5: Solve for x
    x = 349,536.09/635.09
  6. Step 6: Final answer
    x = 550.38

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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.