Home / 49-90

Finding the Third Proportional to 49 and 90

Calculator

Solution

The third proportional to 49 and 90 is: 165.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    49 : 90 = 90 : x
  2. Step 2: Convert to fraction form
    49/90 = 90/x
  3. Step 3: Cross multiply
    49x = 90 × 90
  4. Step 4: Simplify right side
    49x = 8,100
  5. Step 5: Solve for x
    x = 8,100/49
  6. Step 6: Final answer
    x = 165.31

Related Problems

Find third proportional to 24.50 and 45
Half scale
Find third proportional to 98 and 180
Double scale
Find third proportional to 51 and 94
Similar ratio
Find third proportional to 73.50 and 135
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.