Home / 216-324-87.75

Finding the Fourth Proportional to 216, 324 and 87.75

Calculator

Solution

The fourth proportional to 216, 324 and 87.75 is: 131.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    216 : 324 = 87.75 : x
  2. Step 2: Convert to fraction form
    216/324 = 87.75/x
  3. Step 3: Cross multiply
    216x = 324 × 87.75
  4. Step 4: Simplify right side
    216x = 28,431
  5. Step 5: Solve for x
    x = 28,431/216
  6. Step 6: Final answer
    x = 131.63

Related Problems

Find fourth proportional to 108, 162 and 43.88
Half scale
Find fourth proportional to 432, 648 and 175.50
Double scale
Find fourth proportional to 217, 325.50 and 88.75
Similar ratio
Find fourth proportional to 324, 486 and 131.63
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.