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Finding the Fourth Proportional to 209.92, 287.36 and 203.36

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Solution

The fourth proportional to 209.92, 287.36 and 203.36 is: 278.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.92 : 287.36 = 203.36 : x
  2. Step 2: Convert to fraction form
    209.92/287.36 = 203.36/x
  3. Step 3: Cross multiply
    209.92x = 287.36 × 203.36
  4. Step 4: Simplify right side
    209.92x = 58,437.53
  5. Step 5: Solve for x
    x = 58,437.53/209.92
  6. Step 6: Final answer
    x = 278.38

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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.