Home / 101.31-139.82-57.65

Finding the Fourth Proportional to 101.31, 139.82 and 57.65

Calculator

Solution

The fourth proportional to 101.31, 139.82 and 57.65 is: 79.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.31 : 139.82 = 57.65 : x
  2. Step 2: Convert to fraction form
    101.31/139.82 = 57.65/x
  3. Step 3: Cross multiply
    101.31x = 139.82 × 57.65
  4. Step 4: Simplify right side
    101.31x = 8,060.62
  5. Step 5: Solve for x
    x = 8,060.62/101.31
  6. Step 6: Final answer
    x = 79.56

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.