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Finding the Fourth Proportional to 1,262.07, 1,887.66 and 911.43

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Solution

The fourth proportional to 1,262.07, 1,887.66 and 911.43 is: 1,363.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.07 : 1,887.66 = 911.43 : x
  2. Step 2: Convert to fraction form
    1,262.07/1,887.66 = 911.43/x
  3. Step 3: Cross multiply
    1,262.07x = 1,887.66 × 911.43
  4. Step 4: Simplify right side
    1,262.07x = 1,720,469.95
  5. Step 5: Solve for x
    x = 1,720,469.95/1,262.07
  6. Step 6: Final answer
    x = 1,363.21

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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.