Home / 383-489

Finding the Third Proportional to 383 and 489

Calculator

Solution

The third proportional to 383 and 489 is: 624.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    383 : 489 = 489 : x
  2. Step 2: Convert to fraction form
    383/489 = 489/x
  3. Step 3: Cross multiply
    383x = 489 × 489
  4. Step 4: Simplify right side
    383x = 239,121
  5. Step 5: Solve for x
    x = 239,121/383
  6. Step 6: Final answer
    x = 624.34

Related Problems

Find third proportional to 191.50 and 244.50
Half scale
Find third proportional to 766 and 978
Double scale
Find third proportional to 385 and 492
Similar ratio
Find third proportional to 574.50 and 733.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.