Home / 558-1,290

Finding the Third Proportional to 558 and 1,290

Calculator

Solution

The third proportional to 558 and 1,290 is: 2,982.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    558 : 1,290 = 1,290 : x
  2. Step 2: Convert to fraction form
    558/1,290 = 1,290/x
  3. Step 3: Cross multiply
    558x = 1,290 × 1,290
  4. Step 4: Simplify right side
    558x = 1,664,100
  5. Step 5: Solve for x
    x = 1,664,100/558
  6. Step 6: Final answer
    x = 2,982.26

Related Problems

Find third proportional to 279 and 645
Half scale
Find third proportional to 1,116 and 2,580
Double scale
Find third proportional to 560 and 1,295
Similar ratio
Find third proportional to 837 and 1,935
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.