Home / 420.10-579.29-308.12

Finding the Fourth Proportional to 420.10, 579.29 and 308.12

Calculator

Solution

The fourth proportional to 420.10, 579.29 and 308.12 is: 424.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.10 : 579.29 = 308.12 : x
  2. Step 2: Convert to fraction form
    420.10/579.29 = 308.12/x
  3. Step 3: Cross multiply
    420.10x = 579.29 × 308.12
  4. Step 4: Simplify right side
    420.10x = 178,486.40
  5. Step 5: Solve for x
    x = 178,486.40/420.10
  6. Step 6: Final answer
    x = 424.87

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.