Home / 920.31-1,379.52-687.57

Finding the Fourth Proportional to 920.31, 1,379.52 and 687.57

Calculator

Solution

The fourth proportional to 920.31, 1,379.52 and 687.57 is: 1,030.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.31 : 1,379.52 = 687.57 : x
  2. Step 2: Convert to fraction form
    920.31/1,379.52 = 687.57/x
  3. Step 3: Cross multiply
    920.31x = 1,379.52 × 687.57
  4. Step 4: Simplify right side
    920.31x = 948,516.57
  5. Step 5: Solve for x
    x = 948,516.57/920.31
  6. Step 6: Final answer
    x = 1,030.65

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.