Home / 681-987

Finding the Third Proportional to 681 and 987

Calculator

Solution

The third proportional to 681 and 987 is: 1,430.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    681 : 987 = 987 : x
  2. Step 2: Convert to fraction form
    681/987 = 987/x
  3. Step 3: Cross multiply
    681x = 987 × 987
  4. Step 4: Simplify right side
    681x = 974,169
  5. Step 5: Solve for x
    x = 974,169/681
  6. Step 6: Final answer
    x = 1,430.50

Related Problems

Find third proportional to 340.50 and 493.50
Half scale
Find third proportional to 1,362 and 1,974
Double scale
Find third proportional to 683 and 990
Similar ratio
Find third proportional to 1,021.50 and 1,480.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.