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Finding the Fourth Proportional to 438.86, 657.81 and 222.45

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Solution

The fourth proportional to 438.86, 657.81 and 222.45 is: 333.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.86 : 657.81 = 222.45 : x
  2. Step 2: Convert to fraction form
    438.86/657.81 = 222.45/x
  3. Step 3: Cross multiply
    438.86x = 657.81 × 222.45
  4. Step 4: Simplify right side
    438.86x = 146,329.83
  5. Step 5: Solve for x
    x = 146,329.83/438.86
  6. Step 6: Final answer
    x = 333.44

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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.