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Finding the Fourth Proportional to 426.45, 639.68 and 183.15

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Solution

The fourth proportional to 426.45, 639.68 and 183.15 is: 274.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.45 : 639.68 = 183.15 : x
  2. Step 2: Convert to fraction form
    426.45/639.68 = 183.15/x
  3. Step 3: Cross multiply
    426.45x = 639.68 × 183.15
  4. Step 4: Simplify right side
    426.45x = 117,157.39
  5. Step 5: Solve for x
    x = 117,157.39/426.45
  6. Step 6: Final answer
    x = 274.73

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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.