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Finding the Fourth Proportional to 1,272.72, 1,910.90 and 726

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Solution

The fourth proportional to 1,272.72, 1,910.90 and 726 is: 1,090.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.72 : 1,910.90 = 726 : x
  2. Step 2: Convert to fraction form
    1,272.72/1,910.90 = 726/x
  3. Step 3: Cross multiply
    1,272.72x = 1,910.90 × 726
  4. Step 4: Simplify right side
    1,272.72x = 1,387,313.40
  5. Step 5: Solve for x
    x = 1,387,313.40/1,272.72
  6. Step 6: Final answer
    x = 1,090.04

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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.