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Finding the Fourth Proportional to 1,438.74, 1,986.22 and 1,019.44

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Solution

The fourth proportional to 1,438.74, 1,986.22 and 1,019.44 is: 1,407.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.74 : 1,986.22 = 1,019.44 : x
  2. Step 2: Convert to fraction form
    1,438.74/1,986.22 = 1,019.44/x
  3. Step 3: Cross multiply
    1,438.74x = 1,986.22 × 1,019.44
  4. Step 4: Simplify right side
    1,438.74x = 2,024,832.12
  5. Step 5: Solve for x
    x = 2,024,832.12/1,438.74
  6. Step 6: Final answer
    x = 1,407.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.