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Finding the Fourth Proportional to 1,361.90, 2,043.20 and 388.02

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Solution

The fourth proportional to 1,361.90, 2,043.20 and 388.02 is: 582.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.90 : 2,043.20 = 388.02 : x
  2. Step 2: Convert to fraction form
    1,361.90/2,043.20 = 388.02/x
  3. Step 3: Cross multiply
    1,361.90x = 2,043.20 × 388.02
  4. Step 4: Simplify right side
    1,361.90x = 792,802.46
  5. Step 5: Solve for x
    x = 792,802.46/1,361.90
  6. Step 6: Final answer
    x = 582.13

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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.