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Finding the Fourth Proportional to 426.39, 639.67 and 195.39

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Solution

The fourth proportional to 426.39, 639.67 and 195.39 is: 293.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.39 : 639.67 = 195.39 : x
  2. Step 2: Convert to fraction form
    426.39/639.67 = 195.39/x
  3. Step 3: Cross multiply
    426.39x = 639.67 × 195.39
  4. Step 4: Simplify right side
    426.39x = 124,985.12
  5. Step 5: Solve for x
    x = 124,985.12/426.39
  6. Step 6: Final answer
    x = 293.12

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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.