Home / 495-642.25

Finding the Third Proportional to 495 and 642.25

Calculator

Solution

The third proportional to 495 and 642.25 is: 833.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    495 : 642.25 = 642.25 : x
  2. Step 2: Convert to fraction form
    495/642.25 = 642.25/x
  3. Step 3: Cross multiply
    495x = 642.25 × 642.25
  4. Step 4: Simplify right side
    495x = 412,485.06
  5. Step 5: Solve for x
    x = 412,485.06/495
  6. Step 6: Final answer
    x = 833.30

Related Problems

Find third proportional to 247.50 and 321.13
Half scale
Find third proportional to 990 and 1,284.50
Double scale
Find third proportional to 497 and 645
Similar ratio
Find third proportional to 742.50 and 963.38
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.