Home / 348.80-478.59-312.35

Finding the Fourth Proportional to 348.80, 478.59 and 312.35

Calculator

Solution

The fourth proportional to 348.80, 478.59 and 312.35 is: 428.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.80 : 478.59 = 312.35 : x
  2. Step 2: Convert to fraction form
    348.80/478.59 = 312.35/x
  3. Step 3: Cross multiply
    348.80x = 478.59 × 312.35
  4. Step 4: Simplify right side
    348.80x = 149,486.02
  5. Step 5: Solve for x
    x = 149,486.02/348.80
  6. Step 6: Final answer
    x = 428.57

Related Problems

Find fourth proportional to 174.40, 239.29 and 156.18
Half scale
Find fourth proportional to 697.60, 957.17 and 624.70
Double scale
Find fourth proportional to 349.80, 479.96 and 313.35
Similar ratio
Find fourth proportional to 523.20, 717.88 and 468.53
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.