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Finding the Fourth Proportional to 1,387.22, 1,914.09 and 889.79

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Solution

The fourth proportional to 1,387.22, 1,914.09 and 889.79 is: 1,227.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.22 : 1,914.09 = 889.79 : x
  2. Step 2: Convert to fraction form
    1,387.22/1,914.09 = 889.79/x
  3. Step 3: Cross multiply
    1,387.22x = 1,914.09 × 889.79
  4. Step 4: Simplify right side
    1,387.22x = 1,703,128.57
  5. Step 5: Solve for x
    x = 1,703,128.57/1,387.22
  6. Step 6: Final answer
    x = 1,227.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.