Home / 530.40-731.76-399.12

Finding the Fourth Proportional to 530.40, 731.76 and 399.12

Calculator

Solution

The fourth proportional to 530.40, 731.76 and 399.12 is: 550.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.40 : 731.76 = 399.12 : x
  2. Step 2: Convert to fraction form
    530.40/731.76 = 399.12/x
  3. Step 3: Cross multiply
    530.40x = 731.76 × 399.12
  4. Step 4: Simplify right side
    530.40x = 292,060.05
  5. Step 5: Solve for x
    x = 292,060.05/530.40
  6. Step 6: Final answer
    x = 550.64

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.