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Finding the Fourth Proportional to 222.71, 333.86 and 85.72

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Solution

The fourth proportional to 222.71, 333.86 and 85.72 is: 128.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.71 : 333.86 = 85.72 : x
  2. Step 2: Convert to fraction form
    222.71/333.86 = 85.72/x
  3. Step 3: Cross multiply
    222.71x = 333.86 × 85.72
  4. Step 4: Simplify right side
    222.71x = 28,616.90
  5. Step 5: Solve for x
    x = 28,616.90/222.71
  6. Step 6: Final answer
    x = 128.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.