Home / 87.81-131.77-42.18

Finding the Fourth Proportional to 87.81, 131.77 and 42.18

Calculator

Solution

The fourth proportional to 87.81, 131.77 and 42.18 is: 63.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.81 : 131.77 = 42.18 : x
  2. Step 2: Convert to fraction form
    87.81/131.77 = 42.18/x
  3. Step 3: Cross multiply
    87.81x = 131.77 × 42.18
  4. Step 4: Simplify right side
    87.81x = 5,558.16
  5. Step 5: Solve for x
    x = 5,558.16/87.81
  6. Step 6: Final answer
    x = 63.30

Related Problems

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.