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Finding the Fourth Proportional to 1,311.49, 1,967.01 and 489.54

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Solution

The fourth proportional to 1,311.49, 1,967.01 and 489.54 is: 734.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.49 : 1,967.01 = 489.54 : x
  2. Step 2: Convert to fraction form
    1,311.49/1,967.01 = 489.54/x
  3. Step 3: Cross multiply
    1,311.49x = 1,967.01 × 489.54
  4. Step 4: Simplify right side
    1,311.49x = 962,930.08
  5. Step 5: Solve for x
    x = 962,930.08/1,311.49
  6. Step 6: Final answer
    x = 734.23

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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.