Home / 70,554-105,831-21,306

Finding the Fourth Proportional to 70,554, 105,831 and 21,306

Calculator

Solution

The fourth proportional to 70,554, 105,831 and 21,306 is: 31,959

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,554 : 105,831 = 21,306 : x
  2. Step 2: Convert to fraction form
    70,554/105,831 = 21,306/x
  3. Step 3: Cross multiply
    70,554x = 105,831 × 21,306
  4. Step 4: Simplify right side
    70,554x = 2,254,835,286
  5. Step 5: Solve for x
    x = 2,254,835,286/70,554
  6. Step 6: Final answer
    x = 31,959

Related Problems

Find fourth proportional to 35,277, 52,915.50 and 10,653
Half scale
Find fourth proportional to 141,108, 211,662 and 42,612
Double scale
Find fourth proportional to 70,555, 105,832.50 and 21,307
Similar ratio
Find fourth proportional to 105,831, 158,746.50 and 31,959
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.