Home / 1,438.19-2,157.42-398.27

Finding the Fourth Proportional to 1,438.19, 2,157.42 and 398.27

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Solution

The fourth proportional to 1,438.19, 2,157.42 and 398.27 is: 597.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.19 : 2,157.42 = 398.27 : x
  2. Step 2: Convert to fraction form
    1,438.19/2,157.42 = 398.27/x
  3. Step 3: Cross multiply
    1,438.19x = 2,157.42 × 398.27
  4. Step 4: Simplify right side
    1,438.19x = 859,224.88
  5. Step 5: Solve for x
    x = 859,224.88/1,438.19
  6. Step 6: Final answer
    x = 597.43

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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.