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Finding the Fourth Proportional to 1,272.56, 1,908.71 and 450.78

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Solution

The fourth proportional to 1,272.56, 1,908.71 and 450.78 is: 676.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.56 : 1,908.71 = 450.78 : x
  2. Step 2: Convert to fraction form
    1,272.56/1,908.71 = 450.78/x
  3. Step 3: Cross multiply
    1,272.56x = 1,908.71 × 450.78
  4. Step 4: Simplify right side
    1,272.56x = 860,406.04
  5. Step 5: Solve for x
    x = 860,406.04/1,272.56
  6. Step 6: Final answer
    x = 676.12

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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.