Home / 176.70-265.18-128.90

Finding the Fourth Proportional to 176.70, 265.18 and 128.90

Calculator

Solution

The fourth proportional to 176.70, 265.18 and 128.90 is: 193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    176.70 : 265.18 = 128.90 : x
  2. Step 2: Convert to fraction form
    176.70/265.18 = 128.90/x
  3. Step 3: Cross multiply
    176.70x = 265.18 × 128.90
  4. Step 4: Simplify right side
    176.70x = 34,181.70
  5. Step 5: Solve for x
    x = 34,181.70/176.70
  6. Step 6: Final answer
    x = 193.44

Related Problems

Find fourth proportional to 88.35, 132.59 and 64.45
Half scale
Find fourth proportional to 353.40, 530.36 and 257.80
Double scale
Find fourth proportional to 177.70, 266.68 and 129.90
Similar ratio
Find fourth proportional to 265.05, 397.77 and 193.35
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.