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Finding the Fourth Proportional to 1,361.80, 2,042.09 and 387.67

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Solution

The fourth proportional to 1,361.80, 2,042.09 and 387.67 is: 581.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.80 : 2,042.09 = 387.67 : x
  2. Step 2: Convert to fraction form
    1,361.80/2,042.09 = 387.67/x
  3. Step 3: Cross multiply
    1,361.80x = 2,042.09 × 387.67
  4. Step 4: Simplify right side
    1,361.80x = 791,649.99
  5. Step 5: Solve for x
    x = 791,649.99/1,361.80
  6. Step 6: Final answer
    x = 581.33

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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.