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Finding the Fourth Proportional to 427.74, 641.61 and 265.48

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Solution

The fourth proportional to 427.74, 641.61 and 265.48 is: 398.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.74 : 641.61 = 265.48 : x
  2. Step 2: Convert to fraction form
    427.74/641.61 = 265.48/x
  3. Step 3: Cross multiply
    427.74x = 641.61 × 265.48
  4. Step 4: Simplify right side
    427.74x = 170,334.62
  5. Step 5: Solve for x
    x = 170,334.62/427.74
  6. Step 6: Final answer
    x = 398.22

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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.