Home / 89.21-122.01-87.78

Finding the Fourth Proportional to 89.21, 122.01 and 87.78

Calculator

Solution

The fourth proportional to 89.21, 122.01 and 87.78 is: 120.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.21 : 122.01 = 87.78 : x
  2. Step 2: Convert to fraction form
    89.21/122.01 = 87.78/x
  3. Step 3: Cross multiply
    89.21x = 122.01 × 87.78
  4. Step 4: Simplify right side
    89.21x = 10,710.04
  5. Step 5: Solve for x
    x = 10,710.04/89.21
  6. Step 6: Final answer
    x = 120.06

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.