Home / 57.16-78.88-31.28

Finding the Fourth Proportional to 57.16, 78.88 and 31.28

Calculator

Solution

The fourth proportional to 57.16, 78.88 and 31.28 is: 43.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.16 : 78.88 = 31.28 : x
  2. Step 2: Convert to fraction form
    57.16/78.88 = 31.28/x
  3. Step 3: Cross multiply
    57.16x = 78.88 × 31.28
  4. Step 4: Simplify right side
    57.16x = 2,467.21
  5. Step 5: Solve for x
    x = 2,467.21/57.16
  6. Step 6: Final answer
    x = 43.17

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.