Home / 644.50-1,387

Finding the Third Proportional to 644.50 and 1,387

Calculator

Solution

The third proportional to 644.50 and 1,387 is: 2,984.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.50 : 1,387 = 1,387 : x
  2. Step 2: Convert to fraction form
    644.50/1,387 = 1,387/x
  3. Step 3: Cross multiply
    644.50x = 1,387 × 1,387
  4. Step 4: Simplify right side
    644.50x = 1,923,769
  5. Step 5: Solve for x
    x = 1,923,769/644.50
  6. Step 6: Final answer
    x = 2,984.90

Related Problems

Find third proportional to 322.25 and 693.50
Half scale
Find third proportional to 1,289 and 2,774
Double scale
Find third proportional to 647 and 1,391
Similar ratio
Find third proportional to 966.75 and 2,080.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.