Home / 207.97-312.05-86.31

Finding the Fourth Proportional to 207.97, 312.05 and 86.31

Calculator

Solution

The fourth proportional to 207.97, 312.05 and 86.31 is: 129.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.97 : 312.05 = 86.31 : x
  2. Step 2: Convert to fraction form
    207.97/312.05 = 86.31/x
  3. Step 3: Cross multiply
    207.97x = 312.05 × 86.31
  4. Step 4: Simplify right side
    207.97x = 26,933.25
  5. Step 5: Solve for x
    x = 26,933.25/207.97
  6. Step 6: Final answer
    x = 129.51

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.