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Finding the Fourth Proportional to 375.90, 518.70 and 210.09

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Solution

The fourth proportional to 375.90, 518.70 and 210.09 is: 289.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.90 : 518.70 = 210.09 : x
  2. Step 2: Convert to fraction form
    375.90/518.70 = 210.09/x
  3. Step 3: Cross multiply
    375.90x = 518.70 × 210.09
  4. Step 4: Simplify right side
    375.90x = 108,973.68
  5. Step 5: Solve for x
    x = 108,973.68/375.90
  6. Step 6: Final answer
    x = 289.90

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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.