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Finding the Fourth Proportional to 1,228.23, 1,695 and 668.75

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Solution

The fourth proportional to 1,228.23, 1,695 and 668.75 is: 922.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.23 : 1,695 = 668.75 : x
  2. Step 2: Convert to fraction form
    1,228.23/1,695 = 668.75/x
  3. Step 3: Cross multiply
    1,228.23x = 1,695 × 668.75
  4. Step 4: Simplify right side
    1,228.23x = 1,133,531.25
  5. Step 5: Solve for x
    x = 1,133,531.25/1,228.23
  6. Step 6: Final answer
    x = 922.90

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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.