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Finding the Fourth Proportional to 1,351.91, 2,028.10 and 427.45

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Solution

The fourth proportional to 1,351.91, 2,028.10 and 427.45 is: 641.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.91 : 2,028.10 = 427.45 : x
  2. Step 2: Convert to fraction form
    1,351.91/2,028.10 = 427.45/x
  3. Step 3: Cross multiply
    1,351.91x = 2,028.10 × 427.45
  4. Step 4: Simplify right side
    1,351.91x = 866,911.35
  5. Step 5: Solve for x
    x = 866,911.35/1,351.91
  6. Step 6: Final answer
    x = 641.25

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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.