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Finding the Fourth Proportional to 755.19, 1,131.75 and 426.30

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Solution

The fourth proportional to 755.19, 1,131.75 and 426.30 is: 638.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.19 : 1,131.75 = 426.30 : x
  2. Step 2: Convert to fraction form
    755.19/1,131.75 = 426.30/x
  3. Step 3: Cross multiply
    755.19x = 1,131.75 × 426.30
  4. Step 4: Simplify right side
    755.19x = 482,465.03
  5. Step 5: Solve for x
    x = 482,465.03/755.19
  6. Step 6: Final answer
    x = 638.87

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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.