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Finding the Fourth Proportional to 872.09, 1,308.12 and 222.81

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Solution

The fourth proportional to 872.09, 1,308.12 and 222.81 is: 334.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.09 : 1,308.12 = 222.81 : x
  2. Step 2: Convert to fraction form
    872.09/1,308.12 = 222.81/x
  3. Step 3: Cross multiply
    872.09x = 1,308.12 × 222.81
  4. Step 4: Simplify right side
    872.09x = 291,462.22
  5. Step 5: Solve for x
    x = 291,462.22/872.09
  6. Step 6: Final answer
    x = 334.21

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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.