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Finding the Fourth Proportional to 989.46, 1,491.70 and 936.54

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Solution

The fourth proportional to 989.46, 1,491.70 and 936.54 is: 1,411.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.46 : 1,491.70 = 936.54 : x
  2. Step 2: Convert to fraction form
    989.46/1,491.70 = 936.54/x
  3. Step 3: Cross multiply
    989.46x = 1,491.70 × 936.54
  4. Step 4: Simplify right side
    989.46x = 1,397,036.72
  5. Step 5: Solve for x
    x = 1,397,036.72/989.46
  6. Step 6: Final answer
    x = 1,411.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.