Home / 8,220-12,387

Finding the Third Proportional to 8,220 and 12,387

Calculator

Solution

The third proportional to 8,220 and 12,387 is: 18,666.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,220 : 12,387 = 12,387 : x
  2. Step 2: Convert to fraction form
    8,220/12,387 = 12,387/x
  3. Step 3: Cross multiply
    8,220x = 12,387 × 12,387
  4. Step 4: Simplify right side
    8,220x = 153,437,769
  5. Step 5: Solve for x
    x = 153,437,769/8,220
  6. Step 6: Final answer
    x = 18,666.40

Related Problems

Find third proportional to 4,110 and 6,193.50
Half scale
Find third proportional to 16,440 and 24,774
Double scale
Find third proportional to 8,222 and 12,390
Similar ratio
Find third proportional to 12,330 and 18,580.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.