Home / 87.75-121.10-61.92

Finding the Fourth Proportional to 87.75, 121.10 and 61.92

Calculator

Solution

The fourth proportional to 87.75, 121.10 and 61.92 is: 85.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.75 : 121.10 = 61.92 : x
  2. Step 2: Convert to fraction form
    87.75/121.10 = 61.92/x
  3. Step 3: Cross multiply
    87.75x = 121.10 × 61.92
  4. Step 4: Simplify right side
    87.75x = 7,498.20
  5. Step 5: Solve for x
    x = 7,498.20/87.75
  6. Step 6: Final answer
    x = 85.45

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.