Home / 630-1,287

Finding the Third Proportional to 630 and 1,287

Calculator

Solution

The third proportional to 630 and 1,287 is: 2,629.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    630 : 1,287 = 1,287 : x
  2. Step 2: Convert to fraction form
    630/1,287 = 1,287/x
  3. Step 3: Cross multiply
    630x = 1,287 × 1,287
  4. Step 4: Simplify right side
    630x = 1,656,369
  5. Step 5: Solve for x
    x = 1,656,369/630
  6. Step 6: Final answer
    x = 2,629.16

Related Problems

Find third proportional to 315 and 643.50
Half scale
Find third proportional to 1,260 and 2,574
Double scale
Find third proportional to 632 and 1,291
Similar ratio
Find third proportional to 945 and 1,930.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.