Home / 645.75-1,381.50

Finding the Third Proportional to 645.75 and 1,381.50

Calculator

Solution

The third proportional to 645.75 and 1,381.50 is: 2,955.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.75 : 1,381.50 = 1,381.50 : x
  2. Step 2: Convert to fraction form
    645.75/1,381.50 = 1,381.50/x
  3. Step 3: Cross multiply
    645.75x = 1,381.50 × 1,381.50
  4. Step 4: Simplify right side
    645.75x = 1,908,542.25
  5. Step 5: Solve for x
    x = 1,908,542.25/645.75
  6. Step 6: Final answer
    x = 2,955.54

Related Problems

Find third proportional to 322.88 and 690.75
Half scale
Find third proportional to 1,291.50 and 2,763
Double scale
Find third proportional to 648 and 1,386
Similar ratio
Find third proportional to 968.63 and 2,072.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.