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Finding the Fourth Proportional to 1,361.81, 2,042.79 and 387.99

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Solution

The fourth proportional to 1,361.81, 2,042.79 and 387.99 is: 582.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.81 : 2,042.79 = 387.99 : x
  2. Step 2: Convert to fraction form
    1,361.81/2,042.79 = 387.99/x
  3. Step 3: Cross multiply
    1,361.81x = 2,042.79 × 387.99
  4. Step 4: Simplify right side
    1,361.81x = 792,583.91
  5. Step 5: Solve for x
    x = 792,583.91/1,361.81
  6. Step 6: Final answer
    x = 582.01

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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.