Home / 261.50-318.50

Finding the Third Proportional to 261.50 and 318.50

Calculator

Solution

The third proportional to 261.50 and 318.50 is: 387.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.50 : 318.50 = 318.50 : x
  2. Step 2: Convert to fraction form
    261.50/318.50 = 318.50/x
  3. Step 3: Cross multiply
    261.50x = 318.50 × 318.50
  4. Step 4: Simplify right side
    261.50x = 101,442.25
  5. Step 5: Solve for x
    x = 101,442.25/261.50
  6. Step 6: Final answer
    x = 387.92

Related Problems

Find third proportional to 130.75 and 159.25
Half scale
Find third proportional to 523 and 637
Double scale
Find third proportional to 264 and 321
Similar ratio
Find third proportional to 392.25 and 477.75
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.