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Finding the Fourth Proportional to 612.21, 918.09 and 222.11

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Solution

The fourth proportional to 612.21, 918.09 and 222.11 is: 333.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.21 : 918.09 = 222.11 : x
  2. Step 2: Convert to fraction form
    612.21/918.09 = 222.11/x
  3. Step 3: Cross multiply
    612.21x = 918.09 × 222.11
  4. Step 4: Simplify right side
    612.21x = 203,916.45
  5. Step 5: Solve for x
    x = 203,916.45/612.21
  6. Step 6: Final answer
    x = 333.08

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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.