Home / 9,915-15,420

Finding the Third Proportional to 9,915 and 15,420

Calculator

Solution

The third proportional to 9,915 and 15,420 is: 23,981.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915 : 15,420 = 15,420 : x
  2. Step 2: Convert to fraction form
    9,915/15,420 = 15,420/x
  3. Step 3: Cross multiply
    9,915x = 15,420 × 15,420
  4. Step 4: Simplify right side
    9,915x = 237,776,400
  5. Step 5: Solve for x
    x = 237,776,400/9,915
  6. Step 6: Final answer
    x = 23,981.48

Related Problems

Find third proportional to 4,957.50 and 7,710
Half scale
Find third proportional to 19,830 and 30,840
Double scale
Find third proportional to 9,917 and 15,423
Similar ratio
Find third proportional to 14,872.50 and 23,130
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.