Home / 251.81-405.56

Finding the Third Proportional to 251.81 and 405.56

Calculator

Solution

The third proportional to 251.81 and 405.56 is: 653.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.81 : 405.56 = 405.56 : x
  2. Step 2: Convert to fraction form
    251.81/405.56 = 405.56/x
  3. Step 3: Cross multiply
    251.81x = 405.56 × 405.56
  4. Step 4: Simplify right side
    251.81x = 164,480.94
  5. Step 5: Solve for x
    x = 164,480.94/251.81
  6. Step 6: Final answer
    x = 653.19

Related Problems

Find third proportional to 125.91 and 202.78
Half scale
Find third proportional to 503.63 and 811.13
Double scale
Find third proportional to 254 and 409
Similar ratio
Find third proportional to 377.72 and 608.34
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.