Home / 315,342-689,368

Finding the Third Proportional to 315,342 and 689,368

Calculator

Solution

The third proportional to 315,342 and 689,368 is: 1,507,024.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,342 : 689,368 = 689,368 : x
  2. Step 2: Convert to fraction form
    315,342/689,368 = 689,368/x
  3. Step 3: Cross multiply
    315,342x = 689,368 × 689,368
  4. Step 4: Simplify right side
    315,342x = 475,228,239,424
  5. Step 5: Solve for x
    x = 475,228,239,424/315,342
  6. Step 6: Final answer
    x = 1,507,024.88

Related Problems

Find third proportional to 157,671 and 344,684
Half scale
Find third proportional to 630,684 and 1,378,736
Double scale
Find third proportional to 315,344 and 689,372
Similar ratio
Find third proportional to 473,013 and 1,034,052
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.