Home / 440.58-657.64-408

Finding the Fourth Proportional to 440.58, 657.64 and 408

Calculator

Solution

The fourth proportional to 440.58, 657.64 and 408 is: 609.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.58 : 657.64 = 408 : x
  2. Step 2: Convert to fraction form
    440.58/657.64 = 408/x
  3. Step 3: Cross multiply
    440.58x = 657.64 × 408
  4. Step 4: Simplify right side
    440.58x = 268,317.12
  5. Step 5: Solve for x
    x = 268,317.12/440.58
  6. Step 6: Final answer
    x = 609.01

Related Problems

Find fourth proportional to 220.29, 328.82 and 204
Half scale
Find fourth proportional to 881.16, 1,315.28 and 816
Double scale
Find fourth proportional to 441.58, 659.13 and 409
Similar ratio
Find fourth proportional to 660.87, 986.46 and 612
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.