Home / 515,729-788,420

Finding the Third Proportional to 515,729 and 788,420

Calculator

Solution

The third proportional to 515,729 and 788,420 is: 1,205,295.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,729 : 788,420 = 788,420 : x
  2. Step 2: Convert to fraction form
    515,729/788,420 = 788,420/x
  3. Step 3: Cross multiply
    515,729x = 788,420 × 788,420
  4. Step 4: Simplify right side
    515,729x = 621,606,096,400
  5. Step 5: Solve for x
    x = 621,606,096,400/515,729
  6. Step 6: Final answer
    x = 1,205,295.99

Related Problems

Find third proportional to 257,864.50 and 394,210
Half scale
Find third proportional to 1,031,458 and 1,576,840
Double scale
Find third proportional to 515,731 and 788,423
Similar ratio
Find third proportional to 773,593.50 and 1,182,630
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.