Home / 428-627

Finding the Third Proportional to 428 and 627

Calculator

Solution

The third proportional to 428 and 627 is: 918.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428 : 627 = 627 : x
  2. Step 2: Convert to fraction form
    428/627 = 627/x
  3. Step 3: Cross multiply
    428x = 627 × 627
  4. Step 4: Simplify right side
    428x = 393,129
  5. Step 5: Solve for x
    x = 393,129/428
  6. Step 6: Final answer
    x = 918.53

Related Problems

Find third proportional to 214 and 313.50
Half scale
Find third proportional to 856 and 1,254
Double scale
Find third proportional to 430 and 630
Similar ratio
Find third proportional to 642 and 940.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.