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Finding the Fourth Proportional to 426.94, 639.38 and 243.79

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Solution

The fourth proportional to 426.94, 639.38 and 243.79 is: 365.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.94 : 639.38 = 243.79 : x
  2. Step 2: Convert to fraction form
    426.94/639.38 = 243.79/x
  3. Step 3: Cross multiply
    426.94x = 639.38 × 243.79
  4. Step 4: Simplify right side
    426.94x = 155,873.46
  5. Step 5: Solve for x
    x = 155,873.46/426.94
  6. Step 6: Final answer
    x = 365.10

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.