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Finding the Fourth Proportional to 1,272.88, 1,908.36 and 648.27

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Solution

The fourth proportional to 1,272.88, 1,908.36 and 648.27 is: 971.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.88 : 1,908.36 = 648.27 : x
  2. Step 2: Convert to fraction form
    1,272.88/1,908.36 = 648.27/x
  3. Step 3: Cross multiply
    1,272.88x = 1,908.36 × 648.27
  4. Step 4: Simplify right side
    1,272.88x = 1,237,132.54
  5. Step 5: Solve for x
    x = 1,237,132.54/1,272.88
  6. Step 6: Final answer
    x = 971.92

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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.