Home / 686-946.26-489.78

Finding the Fourth Proportional to 686, 946.26 and 489.78

Calculator

Solution

The fourth proportional to 686, 946.26 and 489.78 is: 675.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    686 : 946.26 = 489.78 : x
  2. Step 2: Convert to fraction form
    686/946.26 = 489.78/x
  3. Step 3: Cross multiply
    686x = 946.26 × 489.78
  4. Step 4: Simplify right side
    686x = 463,459.22
  5. Step 5: Solve for x
    x = 463,459.22/686
  6. Step 6: Final answer
    x = 675.60

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.