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Finding the Fourth Proportional to 989.66, 1,371.97 and 936.99

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Solution

The fourth proportional to 989.66, 1,371.97 and 936.99 is: 1,298.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.66 : 1,371.97 = 936.99 : x
  2. Step 2: Convert to fraction form
    989.66/1,371.97 = 936.99/x
  3. Step 3: Cross multiply
    989.66x = 1,371.97 × 936.99
  4. Step 4: Simplify right side
    989.66x = 1,285,516.40
  5. Step 5: Solve for x
    x = 1,285,516.40/989.66
  6. Step 6: Final answer
    x = 1,298.95

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.