Home / 1,311.37-1,966.45-489.42

Finding the Fourth Proportional to 1,311.37, 1,966.45 and 489.42

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Solution

The fourth proportional to 1,311.37, 1,966.45 and 489.42 is: 733.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.37 : 1,966.45 = 489.42 : x
  2. Step 2: Convert to fraction form
    1,311.37/1,966.45 = 489.42/x
  3. Step 3: Cross multiply
    1,311.37x = 1,966.45 × 489.42
  4. Step 4: Simplify right side
    1,311.37x = 962,419.96
  5. Step 5: Solve for x
    x = 962,419.96/1,311.37
  6. Step 6: Final answer
    x = 733.90

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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.