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Finding the Fourth Proportional to 1,438.43, 2,157.37 and 860.63

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Solution

The fourth proportional to 1,438.43, 2,157.37 and 860.63 is: 1,290.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.43 : 2,157.37 = 860.63 : x
  2. Step 2: Convert to fraction form
    1,438.43/2,157.37 = 860.63/x
  3. Step 3: Cross multiply
    1,438.43x = 2,157.37 × 860.63
  4. Step 4: Simplify right side
    1,438.43x = 1,856,684.40
  5. Step 5: Solve for x
    x = 1,856,684.40/1,438.43
  6. Step 6: Final answer
    x = 1,290.78

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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.