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Finding the Fourth Proportional to 426.85, 639.65 and 231.68

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Solution

The fourth proportional to 426.85, 639.65 and 231.68 is: 347.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.85 : 639.65 = 231.68 : x
  2. Step 2: Convert to fraction form
    426.85/639.65 = 231.68/x
  3. Step 3: Cross multiply
    426.85x = 639.65 × 231.68
  4. Step 4: Simplify right side
    426.85x = 148,196.29
  5. Step 5: Solve for x
    x = 148,196.29/426.85
  6. Step 6: Final answer
    x = 347.19

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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.