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Finding the Fourth Proportional to 209.10, 288.69 and 188.31

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Solution

The fourth proportional to 209.10, 288.69 and 188.31 is: 259.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.10 : 288.69 = 188.31 : x
  2. Step 2: Convert to fraction form
    209.10/288.69 = 188.31/x
  3. Step 3: Cross multiply
    209.10x = 288.69 × 188.31
  4. Step 4: Simplify right side
    209.10x = 54,363.21
  5. Step 5: Solve for x
    x = 54,363.21/209.10
  6. Step 6: Final answer
    x = 259.99

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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.