Home / 58.78-128.81

Finding the Third Proportional to 58.78 and 128.81

Calculator

Solution

The third proportional to 58.78 and 128.81 is: 282.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.78 : 128.81 = 128.81 : x
  2. Step 2: Convert to fraction form
    58.78/128.81 = 128.81/x
  3. Step 3: Cross multiply
    58.78x = 128.81 × 128.81
  4. Step 4: Simplify right side
    58.78x = 16,592.66
  5. Step 5: Solve for x
    x = 16,592.66/58.78
  6. Step 6: Final answer
    x = 282.28

Related Problems

Find third proportional to 29.39 and 64.41
Half scale
Find third proportional to 117.56 and 257.63
Double scale
Find third proportional to 61 and 133
Similar ratio
Find third proportional to 88.17 and 193.22
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.