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Finding the Fourth Proportional to 222.25, 306.73 and 128.98

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Solution

The fourth proportional to 222.25, 306.73 and 128.98 is: 178.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.25 : 306.73 = 128.98 : x
  2. Step 2: Convert to fraction form
    222.25/306.73 = 128.98/x
  3. Step 3: Cross multiply
    222.25x = 306.73 × 128.98
  4. Step 4: Simplify right side
    222.25x = 39,561.25
  5. Step 5: Solve for x
    x = 39,561.25/222.25
  6. Step 6: Final answer
    x = 178.00

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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.