Home / 100.15-138.09-75.58

Finding the Fourth Proportional to 100.15, 138.09 and 75.58

Calculator

Solution

The fourth proportional to 100.15, 138.09 and 75.58 is: 104.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.15 : 138.09 = 75.58 : x
  2. Step 2: Convert to fraction form
    100.15/138.09 = 75.58/x
  3. Step 3: Cross multiply
    100.15x = 138.09 × 75.58
  4. Step 4: Simplify right side
    100.15x = 10,436.84
  5. Step 5: Solve for x
    x = 10,436.84/100.15
  6. Step 6: Final answer
    x = 104.21

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.