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Finding the Fourth Proportional to 426.79, 639.47 and 323.95

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Solution

The fourth proportional to 426.79, 639.47 and 323.95 is: 485.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.79 : 639.47 = 323.95 : x
  2. Step 2: Convert to fraction form
    426.79/639.47 = 323.95/x
  3. Step 3: Cross multiply
    426.79x = 639.47 × 323.95
  4. Step 4: Simplify right side
    426.79x = 207,156.31
  5. Step 5: Solve for x
    x = 207,156.31/426.79
  6. Step 6: Final answer
    x = 485.38

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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.