Home / 484.64-668.16-391.28

Finding the Fourth Proportional to 484.64, 668.16 and 391.28

Calculator

Solution

The fourth proportional to 484.64, 668.16 and 391.28 is: 539.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.64 : 668.16 = 391.28 : x
  2. Step 2: Convert to fraction form
    484.64/668.16 = 391.28/x
  3. Step 3: Cross multiply
    484.64x = 668.16 × 391.28
  4. Step 4: Simplify right side
    484.64x = 261,437.64
  5. Step 5: Solve for x
    x = 261,437.64/484.64
  6. Step 6: Final answer
    x = 539.45

Related Problems

Find fourth proportional to 242.32, 334.08 and 195.64
Half scale
Find fourth proportional to 969.28, 1,336.32 and 782.56
Double scale
Find fourth proportional to 485.64, 669.54 and 392.28
Similar ratio
Find fourth proportional to 726.96, 1,002.24 and 586.92
1.5x scale

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.