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Finding the Fourth Proportional to 1,438.89, 2,157.75 and 451.38

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Solution

The fourth proportional to 1,438.89, 2,157.75 and 451.38 is: 676.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.89 : 2,157.75 = 451.38 : x
  2. Step 2: Convert to fraction form
    1,438.89/2,157.75 = 451.38/x
  3. Step 3: Cross multiply
    1,438.89x = 2,157.75 × 451.38
  4. Step 4: Simplify right side
    1,438.89x = 973,959.88
  5. Step 5: Solve for x
    x = 973,959.88/1,438.89
  6. Step 6: Final answer
    x = 676.88

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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.