Home / 388-669

Finding the Third Proportional to 388 and 669

Calculator

Solution

The third proportional to 388 and 669 is: 1,153.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    388 : 669 = 669 : x
  2. Step 2: Convert to fraction form
    388/669 = 669/x
  3. Step 3: Cross multiply
    388x = 669 × 669
  4. Step 4: Simplify right side
    388x = 447,561
  5. Step 5: Solve for x
    x = 447,561/388
  6. Step 6: Final answer
    x = 1,153.51

Related Problems

Find third proportional to 194 and 334.50
Half scale
Find third proportional to 776 and 1,338
Double scale
Find third proportional to 390 and 672
Similar ratio
Find third proportional to 582 and 1,003.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.