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Finding the Fourth Proportional to 1,121.94, 1,682.07 and 774.28

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Solution

The fourth proportional to 1,121.94, 1,682.07 and 774.28 is: 1,160.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.94 : 1,682.07 = 774.28 : x
  2. Step 2: Convert to fraction form
    1,121.94/1,682.07 = 774.28/x
  3. Step 3: Cross multiply
    1,121.94x = 1,682.07 × 774.28
  4. Step 4: Simplify right side
    1,121.94x = 1,302,393.81
  5. Step 5: Solve for x
    x = 1,302,393.81/1,121.94
  6. Step 6: Final answer
    x = 1,160.84

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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.