Home / 623.84-860.64-390.56

Finding the Fourth Proportional to 623.84, 860.64 and 390.56

Calculator

Solution

The fourth proportional to 623.84, 860.64 and 390.56 is: 538.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.84 : 860.64 = 390.56 : x
  2. Step 2: Convert to fraction form
    623.84/860.64 = 390.56/x
  3. Step 3: Cross multiply
    623.84x = 860.64 × 390.56
  4. Step 4: Simplify right side
    623.84x = 336,131.56
  5. Step 5: Solve for x
    x = 336,131.56/623.84
  6. Step 6: Final answer
    x = 538.81

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.