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Finding the Fourth Proportional to 222.06, 306.32 and 155.72

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Solution

The fourth proportional to 222.06, 306.32 and 155.72 is: 214.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.06 : 306.32 = 155.72 : x
  2. Step 2: Convert to fraction form
    222.06/306.32 = 155.72/x
  3. Step 3: Cross multiply
    222.06x = 306.32 × 155.72
  4. Step 4: Simplify right side
    222.06x = 47,700.15
  5. Step 5: Solve for x
    x = 47,700.15/222.06
  6. Step 6: Final answer
    x = 214.81

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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.