Home / 428,128-666,703

Finding the Third Proportional to 428,128 and 666,703

Calculator

Solution

The third proportional to 428,128 and 666,703 is: 1,038,224.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,128 : 666,703 = 666,703 : x
  2. Step 2: Convert to fraction form
    428,128/666,703 = 666,703/x
  3. Step 3: Cross multiply
    428,128x = 666,703 × 666,703
  4. Step 4: Simplify right side
    428,128x = 444,492,890,209
  5. Step 5: Solve for x
    x = 444,492,890,209/428,128
  6. Step 6: Final answer
    x = 1,038,224.29

Related Problems

Find third proportional to 214,064 and 333,351.50
Half scale
Find third proportional to 856,256 and 1,333,406
Double scale
Find third proportional to 428,130 and 666,706
Similar ratio
Find third proportional to 642,192 and 1,000,054.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.