Home / 128,510-278,470

Finding the Third Proportional to 128,510 and 278,470

Calculator

Solution

The third proportional to 128,510 and 278,470 is: 603,420.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,510 : 278,470 = 278,470 : x
  2. Step 2: Convert to fraction form
    128,510/278,470 = 278,470/x
  3. Step 3: Cross multiply
    128,510x = 278,470 × 278,470
  4. Step 4: Simplify right side
    128,510x = 77,545,540,900
  5. Step 5: Solve for x
    x = 77,545,540,900/128,510
  6. Step 6: Final answer
    x = 603,420.29

Related Problems

Find third proportional to 64,255 and 139,235
Half scale
Find third proportional to 257,020 and 556,940
Double scale
Find third proportional to 128,512 and 278,474
Similar ratio
Find third proportional to 192,765 and 417,705
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.