Home / 517.50-817.50

Finding the Third Proportional to 517.50 and 817.50

Calculator

Solution

The third proportional to 517.50 and 817.50 is: 1,291.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.50 : 817.50 = 817.50 : x
  2. Step 2: Convert to fraction form
    517.50/817.50 = 817.50/x
  3. Step 3: Cross multiply
    517.50x = 817.50 × 817.50
  4. Step 4: Simplify right side
    517.50x = 668,306.25
  5. Step 5: Solve for x
    x = 668,306.25/517.50
  6. Step 6: Final answer
    x = 1,291.41

Related Problems

Find third proportional to 258.75 and 408.75
Half scale
Find third proportional to 1,035 and 1,635
Double scale
Find third proportional to 520 and 821
Similar ratio
Find third proportional to 776.25 and 1,226.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.