Home / 904-1,290

Finding the Third Proportional to 904 and 1,290

Calculator

Solution

The third proportional to 904 and 1,290 is: 1,840.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    904 : 1,290 = 1,290 : x
  2. Step 2: Convert to fraction form
    904/1,290 = 1,290/x
  3. Step 3: Cross multiply
    904x = 1,290 × 1,290
  4. Step 4: Simplify right side
    904x = 1,664,100
  5. Step 5: Solve for x
    x = 1,664,100/904
  6. Step 6: Final answer
    x = 1,840.82

Related Problems

Find third proportional to 452 and 645
Half scale
Find third proportional to 1,808 and 2,580
Double scale
Find third proportional to 906 and 1,293
Similar ratio
Find third proportional to 1,356 and 1,935
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.