Home / 1,428.41-2,142.26-388.36

Finding the Fourth Proportional to 1,428.41, 2,142.26 and 388.36

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Solution

The fourth proportional to 1,428.41, 2,142.26 and 388.36 is: 582.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.41 : 2,142.26 = 388.36 : x
  2. Step 2: Convert to fraction form
    1,428.41/2,142.26 = 388.36/x
  3. Step 3: Cross multiply
    1,428.41x = 2,142.26 × 388.36
  4. Step 4: Simplify right side
    1,428.41x = 831,976.58
  5. Step 5: Solve for x
    x = 831,976.58/1,428.41
  6. Step 6: Final answer
    x = 582.45

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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.