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Finding the Fourth Proportional to 755.21, 1,131.76 and 389.23

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Solution

The fourth proportional to 755.21, 1,131.76 and 389.23 is: 583.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.21 : 1,131.76 = 389.23 : x
  2. Step 2: Convert to fraction form
    755.21/1,131.76 = 389.23/x
  3. Step 3: Cross multiply
    755.21x = 1,131.76 × 389.23
  4. Step 4: Simplify right side
    755.21x = 440,514.94
  5. Step 5: Solve for x
    x = 440,514.94/755.21
  6. Step 6: Final answer
    x = 583.30

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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.