Home / 247.50-397.50

Finding the Third Proportional to 247.50 and 397.50

Calculator

Solution

The third proportional to 247.50 and 397.50 is: 638.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.50 : 397.50 = 397.50 : x
  2. Step 2: Convert to fraction form
    247.50/397.50 = 397.50/x
  3. Step 3: Cross multiply
    247.50x = 397.50 × 397.50
  4. Step 4: Simplify right side
    247.50x = 158,006.25
  5. Step 5: Solve for x
    x = 158,006.25/247.50
  6. Step 6: Final answer
    x = 638.41

Related Problems

Find third proportional to 123.75 and 198.75
Half scale
Find third proportional to 495 and 795
Double scale
Find third proportional to 250 and 401
Similar ratio
Find third proportional to 371.25 and 596.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.