Home / 100.70-138.84-86.12

Finding the Fourth Proportional to 100.70, 138.84 and 86.12

Calculator

Solution

The fourth proportional to 100.70, 138.84 and 86.12 is: 118.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.70 : 138.84 = 86.12 : x
  2. Step 2: Convert to fraction form
    100.70/138.84 = 86.12/x
  3. Step 3: Cross multiply
    100.70x = 138.84 × 86.12
  4. Step 4: Simplify right side
    100.70x = 11,956.90
  5. Step 5: Solve for x
    x = 11,956.90/100.70
  6. Step 6: Final answer
    x = 118.74

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.