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Finding the Fourth Proportional to 427.59, 641.47 and 135.14

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Solution

The fourth proportional to 427.59, 641.47 and 135.14 is: 202.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.59 : 641.47 = 135.14 : x
  2. Step 2: Convert to fraction form
    427.59/641.47 = 135.14/x
  3. Step 3: Cross multiply
    427.59x = 641.47 × 135.14
  4. Step 4: Simplify right side
    427.59x = 86,684.88
  5. Step 5: Solve for x
    x = 86,684.88/427.59
  6. Step 6: Final answer
    x = 202.73

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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.