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Finding the Fourth Proportional to 409.12, 564.59 and 222.61

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Solution

The fourth proportional to 409.12, 564.59 and 222.61 is: 307.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.12 : 564.59 = 222.61 : x
  2. Step 2: Convert to fraction form
    409.12/564.59 = 222.61/x
  3. Step 3: Cross multiply
    409.12x = 564.59 × 222.61
  4. Step 4: Simplify right side
    409.12x = 125,680.86
  5. Step 5: Solve for x
    x = 125,680.86/409.12
  6. Step 6: Final answer
    x = 307.20

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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.