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Finding the Fourth Proportional to 426.94, 639.36 and 272.39

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Solution

The fourth proportional to 426.94, 639.36 and 272.39 is: 407.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.94 : 639.36 = 272.39 : x
  2. Step 2: Convert to fraction form
    426.94/639.36 = 272.39/x
  3. Step 3: Cross multiply
    426.94x = 639.36 × 272.39
  4. Step 4: Simplify right side
    426.94x = 174,152.07
  5. Step 5: Solve for x
    x = 174,152.07/426.94
  6. Step 6: Final answer
    x = 407.91

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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.