Home / 1,310.85-1,966.50-489.69

Finding the Fourth Proportional to 1,310.85, 1,966.50 and 489.69

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Solution

The fourth proportional to 1,310.85, 1,966.50 and 489.69 is: 734.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.85 : 1,966.50 = 489.69 : x
  2. Step 2: Convert to fraction form
    1,310.85/1,966.50 = 489.69/x
  3. Step 3: Cross multiply
    1,310.85x = 1,966.50 × 489.69
  4. Step 4: Simplify right side
    1,310.85x = 962,975.39
  5. Step 5: Solve for x
    x = 962,975.39/1,310.85
  6. Step 6: Final answer
    x = 734.62

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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.