Home / 325.80-488.88-257.76

Finding the Fourth Proportional to 325.80, 488.88 and 257.76

Calculator

Solution

The fourth proportional to 325.80, 488.88 and 257.76 is: 386.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.80 : 488.88 = 257.76 : x
  2. Step 2: Convert to fraction form
    325.80/488.88 = 257.76/x
  3. Step 3: Cross multiply
    325.80x = 488.88 × 257.76
  4. Step 4: Simplify right side
    325.80x = 126,013.71
  5. Step 5: Solve for x
    x = 126,013.71/325.80
  6. Step 6: Final answer
    x = 386.78

Related Problems

Find fourth proportional to 162.90, 244.44 and 128.88
Half scale
Find fourth proportional to 651.60, 977.76 and 515.52
Double scale
Find fourth proportional to 326.80, 490.38 and 258.76
Similar ratio
Find fourth proportional to 488.70, 733.32 and 386.64
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.