Home / 555.19-616.78

Finding the Third Proportional to 555.19 and 616.78

Calculator

Solution

The third proportional to 555.19 and 616.78 is: 685.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.19 : 616.78 = 616.78 : x
  2. Step 2: Convert to fraction form
    555.19/616.78 = 616.78/x
  3. Step 3: Cross multiply
    555.19x = 616.78 × 616.78
  4. Step 4: Simplify right side
    555.19x = 380,419.11
  5. Step 5: Solve for x
    x = 380,419.11/555.19
  6. Step 6: Final answer
    x = 685.21

Related Problems

Find third proportional to 277.59 and 308.39
Half scale
Find third proportional to 1,110.38 and 1,233.56
Double scale
Find third proportional to 557 and 619
Similar ratio
Find third proportional to 832.78 and 925.17
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.