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Finding the Fourth Proportional to 755.14, 1,038.54 and 691.42

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Solution

The fourth proportional to 755.14, 1,038.54 and 691.42 is: 950.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.14 : 1,038.54 = 691.42 : x
  2. Step 2: Convert to fraction form
    755.14/1,038.54 = 691.42/x
  3. Step 3: Cross multiply
    755.14x = 1,038.54 × 691.42
  4. Step 4: Simplify right side
    755.14x = 718,067.33
  5. Step 5: Solve for x
    x = 718,067.33/755.14
  6. Step 6: Final answer
    x = 950.91

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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.