Home / 175.80-263.45-139.28

Finding the Fourth Proportional to 175.80, 263.45 and 139.28

Calculator

Solution

The fourth proportional to 175.80, 263.45 and 139.28 is: 208.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    175.80 : 263.45 = 139.28 : x
  2. Step 2: Convert to fraction form
    175.80/263.45 = 139.28/x
  3. Step 3: Cross multiply
    175.80x = 263.45 × 139.28
  4. Step 4: Simplify right side
    175.80x = 36,691.30
  5. Step 5: Solve for x
    x = 36,691.30/175.80
  6. Step 6: Final answer
    x = 208.71

Related Problems

Find fourth proportional to 87.90, 131.72 and 69.64
Half scale
Find fourth proportional to 351.60, 526.89 and 278.55
Double scale
Find fourth proportional to 176.80, 264.94 and 140.28
Similar ratio
Find fourth proportional to 263.70, 395.17 and 208.91
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.