Home / 348.30-522.13-128.87

Finding the Fourth Proportional to 348.30, 522.13 and 128.87

Calculator

Solution

The fourth proportional to 348.30, 522.13 and 128.87 is: 193.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.30 : 522.13 = 128.87 : x
  2. Step 2: Convert to fraction form
    348.30/522.13 = 128.87/x
  3. Step 3: Cross multiply
    348.30x = 522.13 × 128.87
  4. Step 4: Simplify right side
    348.30x = 67,286.89
  5. Step 5: Solve for x
    x = 67,286.89/348.30
  6. Step 6: Final answer
    x = 193.19

Related Problems

Find fourth proportional to 174.15, 261.07 and 64.44
Half scale
Find fourth proportional to 696.60, 1,044.26 and 257.74
Double scale
Find fourth proportional to 349.30, 523.63 and 129.87
Similar ratio
Find fourth proportional to 522.45, 783.20 and 193.31
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.