Home / 1,311.58-1,966.46-489.63

Finding the Fourth Proportional to 1,311.58, 1,966.46 and 489.63

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Solution

The fourth proportional to 1,311.58, 1,966.46 and 489.63 is: 734.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.58 : 1,966.46 = 489.63 : x
  2. Step 2: Convert to fraction form
    1,311.58/1,966.46 = 489.63/x
  3. Step 3: Cross multiply
    1,311.58x = 1,966.46 × 489.63
  4. Step 4: Simplify right side
    1,311.58x = 962,835.36
  5. Step 5: Solve for x
    x = 962,835.36/1,311.58
  6. Step 6: Final answer
    x = 734.10

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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.