Home / 1,351.90-2,028.20-427.47

Finding the Fourth Proportional to 1,351.90, 2,028.20 and 427.47

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Solution

The fourth proportional to 1,351.90, 2,028.20 and 427.47 is: 641.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.90 : 2,028.20 = 427.47 : x
  2. Step 2: Convert to fraction form
    1,351.90/2,028.20 = 427.47/x
  3. Step 3: Cross multiply
    1,351.90x = 2,028.20 × 427.47
  4. Step 4: Simplify right side
    1,351.90x = 866,996.12
  5. Step 5: Solve for x
    x = 866,996.12/1,351.90
  6. Step 6: Final answer
    x = 641.32

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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.