Home / 310,989-421,981.50

Finding the Third Proportional to 310,989 and 421,981.50

Calculator

Solution

The third proportional to 310,989 and 421,981.50 is: 572,587.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,989 : 421,981.50 = 421,981.50 : x
  2. Step 2: Convert to fraction form
    310,989/421,981.50 = 421,981.50/x
  3. Step 3: Cross multiply
    310,989x = 421,981.50 × 421,981.50
  4. Step 4: Simplify right side
    310,989x = 178,068,386,342.25
  5. Step 5: Solve for x
    x = 178,068,386,342.25/310,989
  6. Step 6: Final answer
    x = 572,587.41

Related Problems

Find third proportional to 155,494.50 and 210,990.75
Half scale
Find third proportional to 621,978 and 843,963
Double scale
Find third proportional to 310,991 and 421,984
Similar ratio
Find third proportional to 466,483.50 and 632,972.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.