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Finding the Fourth Proportional to 222.03, 306.30 and 128.74

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Solution

The fourth proportional to 222.03, 306.30 and 128.74 is: 177.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.03 : 306.30 = 128.74 : x
  2. Step 2: Convert to fraction form
    222.03/306.30 = 128.74/x
  3. Step 3: Cross multiply
    222.03x = 306.30 × 128.74
  4. Step 4: Simplify right side
    222.03x = 39,433.06
  5. Step 5: Solve for x
    x = 39,433.06/222.03
  6. Step 6: Final answer
    x = 177.60

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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.