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Finding the Fourth Proportional to 426.04, 639.24 and 220.66

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Solution

The fourth proportional to 426.04, 639.24 and 220.66 is: 331.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.04 : 639.24 = 220.66 : x
  2. Step 2: Convert to fraction form
    426.04/639.24 = 220.66/x
  3. Step 3: Cross multiply
    426.04x = 639.24 × 220.66
  4. Step 4: Simplify right side
    426.04x = 141,054.70
  5. Step 5: Solve for x
    x = 141,054.70/426.04
  6. Step 6: Final answer
    x = 331.08

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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.