Home / 10.50-18

Finding the Third Proportional to 10.50 and 18

Calculator

Solution

The third proportional to 10.50 and 18 is: 30.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.50 : 18 = 18 : x
  2. Step 2: Convert to fraction form
    10.50/18 = 18/x
  3. Step 3: Cross multiply
    10.50x = 18 × 18
  4. Step 4: Simplify right side
    10.50x = 324
  5. Step 5: Solve for x
    x = 324/10.50
  6. Step 6: Final answer
    x = 30.86

Related Problems

Find third proportional to 5.25 and 9
Half scale
Find third proportional to 21 and 36
Double scale
Find third proportional to 13 and 21
Similar ratio
Find third proportional to 15.75 and 27
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.