Home / 87.09-129.95-71.97

Finding the Fourth Proportional to 87.09, 129.95 and 71.97

Calculator

Solution

The fourth proportional to 87.09, 129.95 and 71.97 is: 107.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.09 : 129.95 = 71.97 : x
  2. Step 2: Convert to fraction form
    87.09/129.95 = 71.97/x
  3. Step 3: Cross multiply
    87.09x = 129.95 × 71.97
  4. Step 4: Simplify right side
    87.09x = 9,352.14
  5. Step 5: Solve for x
    x = 9,352.14/87.09
  6. Step 6: Final answer
    x = 107.38

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.