Home / 131.38-197.10-90.70

Finding the Fourth Proportional to 131.38, 197.10 and 90.70

Calculator

Solution

The fourth proportional to 131.38, 197.10 and 90.70 is: 136.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.38 : 197.10 = 90.70 : x
  2. Step 2: Convert to fraction form
    131.38/197.10 = 90.70/x
  3. Step 3: Cross multiply
    131.38x = 197.10 × 90.70
  4. Step 4: Simplify right side
    131.38x = 17,876.97
  5. Step 5: Solve for x
    x = 17,876.97/131.38
  6. Step 6: Final answer
    x = 136.07

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.