Home / 128,640-198,792

Finding the Third Proportional to 128,640 and 198,792

Calculator

Solution

The third proportional to 128,640 and 198,792 is: 307,200.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,640 : 198,792 = 198,792 : x
  2. Step 2: Convert to fraction form
    128,640/198,792 = 198,792/x
  3. Step 3: Cross multiply
    128,640x = 198,792 × 198,792
  4. Step 4: Simplify right side
    128,640x = 39,518,259,264
  5. Step 5: Solve for x
    x = 39,518,259,264/128,640
  6. Step 6: Final answer
    x = 307,200.40

Related Problems

Find third proportional to 64,320 and 99,396
Half scale
Find third proportional to 257,280 and 397,584
Double scale
Find third proportional to 128,642 and 198,795
Similar ratio
Find third proportional to 192,960 and 298,188
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.