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Finding the Fourth Proportional to 375.30, 517.90 and 209.51

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Solution

The fourth proportional to 375.30, 517.90 and 209.51 is: 289.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.30 : 517.90 = 209.51 : x
  2. Step 2: Convert to fraction form
    375.30/517.90 = 209.51/x
  3. Step 3: Cross multiply
    375.30x = 517.90 × 209.51
  4. Step 4: Simplify right side
    375.30x = 108,504.06
  5. Step 5: Solve for x
    x = 108,504.06/375.30
  6. Step 6: Final answer
    x = 289.12

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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.