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Finding the Fourth Proportional to 1,396.50, 1,927.31 and 872.43

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Solution

The fourth proportional to 1,396.50, 1,927.31 and 872.43 is: 1,204.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.50 : 1,927.31 = 872.43 : x
  2. Step 2: Convert to fraction form
    1,396.50/1,927.31 = 872.43/x
  3. Step 3: Cross multiply
    1,396.50x = 1,927.31 × 872.43
  4. Step 4: Simplify right side
    1,396.50x = 1,681,438.70
  5. Step 5: Solve for x
    x = 1,681,438.70/1,396.50
  6. Step 6: Final answer
    x = 1,204.04

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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.