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Finding the Fourth Proportional to 1,264.49, 1,893.39 and 989.29

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Solution

The fourth proportional to 1,264.49, 1,893.39 and 989.29 is: 1,481.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.49 : 1,893.39 = 989.29 : x
  2. Step 2: Convert to fraction form
    1,264.49/1,893.39 = 989.29/x
  3. Step 3: Cross multiply
    1,264.49x = 1,893.39 × 989.29
  4. Step 4: Simplify right side
    1,264.49x = 1,873,111.79
  5. Step 5: Solve for x
    x = 1,873,111.79/1,264.49
  6. Step 6: Final answer
    x = 1,481.32

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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.