Home / 340.88-639.56

Finding the Third Proportional to 340.88 and 639.56

Calculator

Solution

The third proportional to 340.88 and 639.56 is: 1,199.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.88 : 639.56 = 639.56 : x
  2. Step 2: Convert to fraction form
    340.88/639.56 = 639.56/x
  3. Step 3: Cross multiply
    340.88x = 639.56 × 639.56
  4. Step 4: Simplify right side
    340.88x = 409,040.19
  5. Step 5: Solve for x
    x = 409,040.19/340.88
  6. Step 6: Final answer
    x = 1,199.97

Related Problems

Find third proportional to 170.44 and 319.78
Half scale
Find third proportional to 681.75 and 1,279.13
Double scale
Find third proportional to 343 and 643
Similar ratio
Find third proportional to 511.31 and 959.34
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.