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Finding the Fourth Proportional to 1,425.55, 2,138.55 and 451.56

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Solution

The fourth proportional to 1,425.55, 2,138.55 and 451.56 is: 677.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.55 : 2,138.55 = 451.56 : x
  2. Step 2: Convert to fraction form
    1,425.55/2,138.55 = 451.56/x
  3. Step 3: Cross multiply
    1,425.55x = 2,138.55 × 451.56
  4. Step 4: Simplify right side
    1,425.55x = 965,683.64
  5. Step 5: Solve for x
    x = 965,683.64/1,425.55
  6. Step 6: Final answer
    x = 677.41

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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.