Home / 681-1,021.50-225

Finding the Fourth Proportional to 681, 1,021.50 and 225

Calculator

Solution

The fourth proportional to 681, 1,021.50 and 225 is: 337.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    681 : 1,021.50 = 225 : x
  2. Step 2: Convert to fraction form
    681/1,021.50 = 225/x
  3. Step 3: Cross multiply
    681x = 1,021.50 × 225
  4. Step 4: Simplify right side
    681x = 229,837.50
  5. Step 5: Solve for x
    x = 229,837.50/681
  6. Step 6: Final answer
    x = 337.50

Related Problems

Find fourth proportional to 340.50, 510.75 and 112.50
Half scale
Find fourth proportional to 1,362, 2,043 and 450
Double scale
Find fourth proportional to 682, 1,023 and 226
Similar ratio
Find fourth proportional to 1,021.50, 1,532.25 and 337.50
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.