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Finding the Fourth Proportional to 1,291.43, 1,782.45 and 849.37

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Solution

The fourth proportional to 1,291.43, 1,782.45 and 849.37 is: 1,172.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.43 : 1,782.45 = 849.37 : x
  2. Step 2: Convert to fraction form
    1,291.43/1,782.45 = 849.37/x
  3. Step 3: Cross multiply
    1,291.43x = 1,782.45 × 849.37
  4. Step 4: Simplify right side
    1,291.43x = 1,513,959.56
  5. Step 5: Solve for x
    x = 1,513,959.56/1,291.43
  6. Step 6: Final answer
    x = 1,172.31

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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.