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Finding the Fourth Proportional to 425.95, 639.28 and 169.63

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Solution

The fourth proportional to 425.95, 639.28 and 169.63 is: 254.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.95 : 639.28 = 169.63 : x
  2. Step 2: Convert to fraction form
    425.95/639.28 = 169.63/x
  3. Step 3: Cross multiply
    425.95x = 639.28 × 169.63
  4. Step 4: Simplify right side
    425.95x = 108,441.07
  5. Step 5: Solve for x
    x = 108,441.07/425.95
  6. Step 6: Final answer
    x = 254.59

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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.