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Finding the Fourth Proportional to 1,542.51, 2,128.71 and 843.88

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Solution

The fourth proportional to 1,542.51, 2,128.71 and 843.88 is: 1,164.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.51 : 2,128.71 = 843.88 : x
  2. Step 2: Convert to fraction form
    1,542.51/2,128.71 = 843.88/x
  3. Step 3: Cross multiply
    1,542.51x = 2,128.71 × 843.88
  4. Step 4: Simplify right side
    1,542.51x = 1,796,375.79
  5. Step 5: Solve for x
    x = 1,796,375.79/1,542.51
  6. Step 6: Final answer
    x = 1,164.58

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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.