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Finding the Fourth Proportional to 1,351.68, 2,027.90 and 427.22

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Solution

The fourth proportional to 1,351.68, 2,027.90 and 427.22 is: 640.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.68 : 2,027.90 = 427.22 : x
  2. Step 2: Convert to fraction form
    1,351.68/2,027.90 = 427.22/x
  3. Step 3: Cross multiply
    1,351.68x = 2,027.90 × 427.22
  4. Step 4: Simplify right side
    1,351.68x = 866,347.16
  5. Step 5: Solve for x
    x = 866,347.16/1,351.68
  6. Step 6: Final answer
    x = 640.94

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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.