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Finding the Fourth Proportional to 1,282.91, 1,918.35 and 916.56

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Solution

The fourth proportional to 1,282.91, 1,918.35 and 916.56 is: 1,370.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.91 : 1,918.35 = 916.56 : x
  2. Step 2: Convert to fraction form
    1,282.91/1,918.35 = 916.56/x
  3. Step 3: Cross multiply
    1,282.91x = 1,918.35 × 916.56
  4. Step 4: Simplify right side
    1,282.91x = 1,758,282.88
  5. Step 5: Solve for x
    x = 1,758,282.88/1,282.91
  6. Step 6: Final answer
    x = 1,370.55

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