Home / 351.75-643.50

Finding the Third Proportional to 351.75 and 643.50

Calculator

Solution

The third proportional to 351.75 and 643.50 is: 1,177.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.75 : 643.50 = 643.50 : x
  2. Step 2: Convert to fraction form
    351.75/643.50 = 643.50/x
  3. Step 3: Cross multiply
    351.75x = 643.50 × 643.50
  4. Step 4: Simplify right side
    351.75x = 414,092.25
  5. Step 5: Solve for x
    x = 414,092.25/351.75
  6. Step 6: Final answer
    x = 1,177.23

Related Problems

Find third proportional to 175.88 and 321.75
Half scale
Find third proportional to 703.50 and 1,287
Double scale
Find third proportional to 354 and 647
Similar ratio
Find third proportional to 527.63 and 965.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.83) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.