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Finding the Fourth Proportional to 375.19, 517.78 and 209.42

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Solution

The fourth proportional to 375.19, 517.78 and 209.42 is: 289.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.19 : 517.78 = 209.42 : x
  2. Step 2: Convert to fraction form
    375.19/517.78 = 209.42/x
  3. Step 3: Cross multiply
    375.19x = 517.78 × 209.42
  4. Step 4: Simplify right side
    375.19x = 108,430.90
  5. Step 5: Solve for x
    x = 108,430.90/375.19
  6. Step 6: Final answer
    x = 289.01

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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.