Home / 387.50-817.75

Finding the Third Proportional to 387.50 and 817.75

Calculator

Solution

The third proportional to 387.50 and 817.75 is: 1,725.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.50 : 817.75 = 817.75 : x
  2. Step 2: Convert to fraction form
    387.50/817.75 = 817.75/x
  3. Step 3: Cross multiply
    387.50x = 817.75 × 817.75
  4. Step 4: Simplify right side
    387.50x = 668,715.06
  5. Step 5: Solve for x
    x = 668,715.06/387.50
  6. Step 6: Final answer
    x = 1,725.72

Related Problems

Find third proportional to 193.75 and 408.88
Half scale
Find third proportional to 775 and 1,635.50
Double scale
Find third proportional to 390 and 822
Similar ratio
Find third proportional to 581.25 and 1,226.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.