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Finding the Fourth Proportional to 427.58, 641.30 and 119.45

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Solution

The fourth proportional to 427.58, 641.30 and 119.45 is: 179.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.58 : 641.30 = 119.45 : x
  2. Step 2: Convert to fraction form
    427.58/641.30 = 119.45/x
  3. Step 3: Cross multiply
    427.58x = 641.30 × 119.45
  4. Step 4: Simplify right side
    427.58x = 76,599.48
  5. Step 5: Solve for x
    x = 76,599.48/427.58
  6. Step 6: Final answer
    x = 179.15

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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.