Home / 138.17-207.08-121.08

Finding the Fourth Proportional to 138.17, 207.08 and 121.08

Calculator

Solution

The fourth proportional to 138.17, 207.08 and 121.08 is: 181.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.17 : 207.08 = 121.08 : x
  2. Step 2: Convert to fraction form
    138.17/207.08 = 121.08/x
  3. Step 3: Cross multiply
    138.17x = 207.08 × 121.08
  4. Step 4: Simplify right side
    138.17x = 25,073.92
  5. Step 5: Solve for x
    x = 25,073.92/138.17
  6. Step 6: Final answer
    x = 181.47

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.