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Finding the Fourth Proportional to 1,208.94, 1,811.92 and 689.38

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Solution

The fourth proportional to 1,208.94, 1,811.92 and 689.38 is: 1,033.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.94 : 1,811.92 = 689.38 : x
  2. Step 2: Convert to fraction form
    1,208.94/1,811.92 = 689.38/x
  3. Step 3: Cross multiply
    1,208.94x = 1,811.92 × 689.38
  4. Step 4: Simplify right side
    1,208.94x = 1,249,101.41
  5. Step 5: Solve for x
    x = 1,249,101.41/1,208.94
  6. Step 6: Final answer
    x = 1,033.22

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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.