Home / 486-729.28-258

Finding the Fourth Proportional to 486, 729.28 and 258

Calculator

Solution

The fourth proportional to 486, 729.28 and 258 is: 387.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    486 : 729.28 = 258 : x
  2. Step 2: Convert to fraction form
    486/729.28 = 258/x
  3. Step 3: Cross multiply
    486x = 729.28 × 258
  4. Step 4: Simplify right side
    486x = 188,154.24
  5. Step 5: Solve for x
    x = 188,154.24/486
  6. Step 6: Final answer
    x = 387.15

Related Problems

Find fourth proportional to 243, 364.64 and 129
Half scale
Find fourth proportional to 972, 1,458.56 and 516
Double scale
Find fourth proportional to 487, 730.78 and 259
Similar ratio
Find fourth proportional to 729, 1,093.92 and 387
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.