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Finding the Fourth Proportional to 221.07, 304.83 and 209.53

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Solution

The fourth proportional to 221.07, 304.83 and 209.53 is: 288.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.07 : 304.83 = 209.53 : x
  2. Step 2: Convert to fraction form
    221.07/304.83 = 209.53/x
  3. Step 3: Cross multiply
    221.07x = 304.83 × 209.53
  4. Step 4: Simplify right side
    221.07x = 63,871.41
  5. Step 5: Solve for x
    x = 63,871.41/221.07
  6. Step 6: Final answer
    x = 288.91

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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.