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Finding the Fourth Proportional to 1,243.20, 1,868.43 and 834.75

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Solution

The fourth proportional to 1,243.20, 1,868.43 and 834.75 is: 1,254.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.20 : 1,868.43 = 834.75 : x
  2. Step 2: Convert to fraction form
    1,243.20/1,868.43 = 834.75/x
  3. Step 3: Cross multiply
    1,243.20x = 1,868.43 × 834.75
  4. Step 4: Simplify right side
    1,243.20x = 1,559,671.94
  5. Step 5: Solve for x
    x = 1,559,671.94/1,243.20
  6. Step 6: Final answer
    x = 1,254.56

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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.