Home / 313-469.50-85

Finding the Fourth Proportional to 313, 469.50 and 85

Calculator

Solution

The fourth proportional to 313, 469.50 and 85 is: 127.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    313 : 469.50 = 85 : x
  2. Step 2: Convert to fraction form
    313/469.50 = 85/x
  3. Step 3: Cross multiply
    313x = 469.50 × 85
  4. Step 4: Simplify right side
    313x = 39,907.50
  5. Step 5: Solve for x
    x = 39,907.50/313
  6. Step 6: Final answer
    x = 127.50

Related Problems

Find fourth proportional to 156.50, 234.75 and 42.50
Half scale
Find fourth proportional to 626, 939 and 170
Double scale
Find fourth proportional to 314, 471 and 86
Similar ratio
Find fourth proportional to 469.50, 704.25 and 127.50
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.