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Finding the Fourth Proportional to 209.20, 287.28 and 206.24

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Solution

The fourth proportional to 209.20, 287.28 and 206.24 is: 283.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.20 : 287.28 = 206.24 : x
  2. Step 2: Convert to fraction form
    209.20/287.28 = 206.24/x
  3. Step 3: Cross multiply
    209.20x = 287.28 × 206.24
  4. Step 4: Simplify right side
    209.20x = 59,248.63
  5. Step 5: Solve for x
    x = 59,248.63/209.20
  6. Step 6: Final answer
    x = 283.22

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.