Home / 181.40-271.90-78.65

Finding the Fourth Proportional to 181.40, 271.90 and 78.65

Calculator

Solution

The fourth proportional to 181.40, 271.90 and 78.65 is: 117.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.40 : 271.90 = 78.65 : x
  2. Step 2: Convert to fraction form
    181.40/271.90 = 78.65/x
  3. Step 3: Cross multiply
    181.40x = 271.90 × 78.65
  4. Step 4: Simplify right side
    181.40x = 21,384.94
  5. Step 5: Solve for x
    x = 21,384.94/181.40
  6. Step 6: Final answer
    x = 117.89

Related Problems

Find fourth proportional to 90.70, 135.95 and 39.33
Half scale
Find fourth proportional to 362.80, 543.80 and 157.30
Double scale
Find fourth proportional to 182.40, 273.40 and 79.65
Similar ratio
Find fourth proportional to 272.10, 407.85 and 117.98
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.