Home / 387.28-493.59

Finding the Third Proportional to 387.28 and 493.59

Calculator

Solution

The third proportional to 387.28 and 493.59 is: 629.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.28 : 493.59 = 493.59 : x
  2. Step 2: Convert to fraction form
    387.28/493.59 = 493.59/x
  3. Step 3: Cross multiply
    387.28x = 493.59 × 493.59
  4. Step 4: Simplify right side
    387.28x = 243,634.79
  5. Step 5: Solve for x
    x = 243,634.79/387.28
  6. Step 6: Final answer
    x = 629.09

Related Problems

Find third proportional to 193.64 and 246.80
Half scale
Find third proportional to 774.56 and 987.19
Double scale
Find third proportional to 389 and 496
Similar ratio
Find third proportional to 580.92 and 740.39
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.