Home / 685.50-1,521

Finding the Third Proportional to 685.50 and 1,521

Calculator

Solution

The third proportional to 685.50 and 1,521 is: 3,374.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.50 : 1,521 = 1,521 : x
  2. Step 2: Convert to fraction form
    685.50/1,521 = 1,521/x
  3. Step 3: Cross multiply
    685.50x = 1,521 × 1,521
  4. Step 4: Simplify right side
    685.50x = 2,313,441
  5. Step 5: Solve for x
    x = 2,313,441/685.50
  6. Step 6: Final answer
    x = 3,374.82

Related Problems

Find third proportional to 342.75 and 760.50
Half scale
Find third proportional to 1,371 and 3,042
Double scale
Find third proportional to 688 and 1,525
Similar ratio
Find third proportional to 1,028.25 and 2,281.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.