Home / 1-7

Finding the Third Proportional to 1 and 7

Calculator

Solution

The third proportional to 1 and 7 is: 49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1 : 7 = 7 : x
  2. Step 2: Convert to fraction form
    1/7 = 7/x
  3. Step 3: Cross multiply
    1x = 7 × 7
  4. Step 4: Simplify right side
    1x = 49
  5. Step 5: Solve for x
    x = 49/1
  6. Step 6: Final answer
    x = 49

Related Problems

Find third proportional to 0.50 and 3.50
Half scale
Find third proportional to 2 and 14
Double scale
Find third proportional to 3 and 21
Similar ratio
Find third proportional to 1.50 and 10.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (7) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.