Home / 421-623

Finding the Third Proportional to 421 and 623

Calculator

Solution

The third proportional to 421 and 623 is: 921.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 623 = 623 : x
  2. Step 2: Convert to fraction form
    421/623 = 623/x
  3. Step 3: Cross multiply
    421x = 623 × 623
  4. Step 4: Simplify right side
    421x = 388,129
  5. Step 5: Solve for x
    x = 388,129/421
  6. Step 6: Final answer
    x = 921.92

Related Problems

Find third proportional to 210.50 and 311.50
Half scale
Find third proportional to 842 and 1,246
Double scale
Find third proportional to 423 and 626
Similar ratio
Find third proportional to 631.50 and 934.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.