Home / 1,311.21-1,966.63-489.30

Finding the Fourth Proportional to 1,311.21, 1,966.63 and 489.30

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Solution

The fourth proportional to 1,311.21, 1,966.63 and 489.30 is: 733.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.21 : 1,966.63 = 489.30 : x
  2. Step 2: Convert to fraction form
    1,311.21/1,966.63 = 489.30/x
  3. Step 3: Cross multiply
    1,311.21x = 1,966.63 × 489.30
  4. Step 4: Simplify right side
    1,311.21x = 962,272.06
  5. Step 5: Solve for x
    x = 962,272.06/1,311.21
  6. Step 6: Final answer
    x = 733.88

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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.