Home / 688.12-949.70-478.18

Finding the Fourth Proportional to 688.12, 949.70 and 478.18

Calculator

Solution

The fourth proportional to 688.12, 949.70 and 478.18 is: 659.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.12 : 949.70 = 478.18 : x
  2. Step 2: Convert to fraction form
    688.12/949.70 = 478.18/x
  3. Step 3: Cross multiply
    688.12x = 949.70 × 478.18
  4. Step 4: Simplify right side
    688.12x = 454,129.93
  5. Step 5: Solve for x
    x = 454,129.93/688.12
  6. Step 6: Final answer
    x = 659.96

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.