Home / 527.70-728.06-317.90

Finding the Fourth Proportional to 527.70, 728.06 and 317.90

Calculator

Solution

The fourth proportional to 527.70, 728.06 and 317.90 is: 438.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.70 : 728.06 = 317.90 : x
  2. Step 2: Convert to fraction form
    527.70/728.06 = 317.90/x
  3. Step 3: Cross multiply
    527.70x = 728.06 × 317.90
  4. Step 4: Simplify right side
    527.70x = 231,450.27
  5. Step 5: Solve for x
    x = 231,450.27/527.70
  6. Step 6: Final answer
    x = 438.60

Related Problems

Find fourth proportional to 263.85, 364.03 and 158.95
Half scale
Find fourth proportional to 1,055.40, 1,456.12 and 635.80
Double scale
Find fourth proportional to 528.70, 729.44 and 318.90
Similar ratio
Find fourth proportional to 791.55, 1,092.09 and 476.85
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.