Home / 790-1,490

Finding the Third Proportional to 790 and 1,490

Calculator

Solution

The third proportional to 790 and 1,490 is: 2,810.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    790 : 1,490 = 1,490 : x
  2. Step 2: Convert to fraction form
    790/1,490 = 1,490/x
  3. Step 3: Cross multiply
    790x = 1,490 × 1,490
  4. Step 4: Simplify right side
    790x = 2,220,100
  5. Step 5: Solve for x
    x = 2,220,100/790
  6. Step 6: Final answer
    x = 2,810.25

Related Problems

Find third proportional to 395 and 745
Half scale
Find third proportional to 1,580 and 2,980
Double scale
Find third proportional to 792 and 1,494
Similar ratio
Find third proportional to 1,185 and 2,235
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.89) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.