Home / 87,130-128,142

Finding the Third Proportional to 87,130 and 128,142

Calculator

Solution

The third proportional to 87,130 and 128,142 is: 188,458.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,130 : 128,142 = 128,142 : x
  2. Step 2: Convert to fraction form
    87,130/128,142 = 128,142/x
  3. Step 3: Cross multiply
    87,130x = 128,142 × 128,142
  4. Step 4: Simplify right side
    87,130x = 16,420,372,164
  5. Step 5: Solve for x
    x = 16,420,372,164/87,130
  6. Step 6: Final answer
    x = 188,458.31

Related Problems

Find third proportional to 43,565 and 64,071
Half scale
Find third proportional to 174,260 and 256,284
Double scale
Find third proportional to 87,132 and 128,145
Similar ratio
Find third proportional to 130,695 and 192,213
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.