Home / 423.56-643.57

Finding the Third Proportional to 423.56 and 643.57

Calculator

Solution

The third proportional to 423.56 and 643.57 is: 977.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.56 : 643.57 = 643.57 : x
  2. Step 2: Convert to fraction form
    423.56/643.57 = 643.57/x
  3. Step 3: Cross multiply
    423.56x = 643.57 × 643.57
  4. Step 4: Simplify right side
    423.56x = 414,182.75
  5. Step 5: Solve for x
    x = 414,182.75/423.56
  6. Step 6: Final answer
    x = 977.86

Related Problems

Find third proportional to 211.78 and 321.79
Half scale
Find third proportional to 847.13 and 1,287.14
Double scale
Find third proportional to 426 and 647
Similar ratio
Find third proportional to 635.34 and 965.36
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.