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Finding the Fourth Proportional to 1,396.97, 1,927.87 and 767.55

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Solution

The fourth proportional to 1,396.97, 1,927.87 and 767.55 is: 1,059.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.97 : 1,927.87 = 767.55 : x
  2. Step 2: Convert to fraction form
    1,396.97/1,927.87 = 767.55/x
  3. Step 3: Cross multiply
    1,396.97x = 1,927.87 × 767.55
  4. Step 4: Simplify right side
    1,396.97x = 1,479,741.93
  5. Step 5: Solve for x
    x = 1,479,741.93/1,396.97
  6. Step 6: Final answer
    x = 1,059.25

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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.