Home / 173-387

Finding the Third Proportional to 173 and 387

Calculator

Solution

The third proportional to 173 and 387 is: 865.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    173 : 387 = 387 : x
  2. Step 2: Convert to fraction form
    173/387 = 387/x
  3. Step 3: Cross multiply
    173x = 387 × 387
  4. Step 4: Simplify right side
    173x = 149,769
  5. Step 5: Solve for x
    x = 149,769/173
  6. Step 6: Final answer
    x = 865.72

Related Problems

Find third proportional to 86.50 and 193.50
Half scale
Find third proportional to 346 and 774
Double scale
Find third proportional to 175 and 391
Similar ratio
Find third proportional to 259.50 and 580.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.