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Finding the Fourth Proportional to 220.78, 304.24 and 187.98

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Solution

The fourth proportional to 220.78, 304.24 and 187.98 is: 259.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.78 : 304.24 = 187.98 : x
  2. Step 2: Convert to fraction form
    220.78/304.24 = 187.98/x
  3. Step 3: Cross multiply
    220.78x = 304.24 × 187.98
  4. Step 4: Simplify right side
    220.78x = 57,191.04
  5. Step 5: Solve for x
    x = 57,191.04/220.78
  6. Step 6: Final answer
    x = 259.04

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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.