Home / 786.46-1,085.32-491.90

Finding the Fourth Proportional to 786.46, 1,085.32 and 491.90

Calculator

Solution

The fourth proportional to 786.46, 1,085.32 and 491.90 is: 678.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.46 : 1,085.32 = 491.90 : x
  2. Step 2: Convert to fraction form
    786.46/1,085.32 = 491.90/x
  3. Step 3: Cross multiply
    786.46x = 1,085.32 × 491.90
  4. Step 4: Simplify right side
    786.46x = 533,868.91
  5. Step 5: Solve for x
    x = 533,868.91/786.46
  6. Step 6: Final answer
    x = 678.83

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.