Home / 998.90-1,378.52-556.81

Finding the Fourth Proportional to 998.90, 1,378.52 and 556.81

Calculator

Solution

The fourth proportional to 998.90, 1,378.52 and 556.81 is: 768.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.90 : 1,378.52 = 556.81 : x
  2. Step 2: Convert to fraction form
    998.90/1,378.52 = 556.81/x
  3. Step 3: Cross multiply
    998.90x = 1,378.52 × 556.81
  4. Step 4: Simplify right side
    998.90x = 767,569.58
  5. Step 5: Solve for x
    x = 767,569.58/998.90
  6. Step 6: Final answer
    x = 768.42

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.