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Finding the Fourth Proportional to 220.70, 304.08 and 208.55

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Solution

The fourth proportional to 220.70, 304.08 and 208.55 is: 287.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.70 : 304.08 = 208.55 : x
  2. Step 2: Convert to fraction form
    220.70/304.08 = 208.55/x
  3. Step 3: Cross multiply
    220.70x = 304.08 × 208.55
  4. Step 4: Simplify right side
    220.70x = 63,415.88
  5. Step 5: Solve for x
    x = 63,415.88/220.70
  6. Step 6: Final answer
    x = 287.34

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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.