Home / 589.20-812.79-379.50

Finding the Fourth Proportional to 589.20, 812.79 and 379.50

Calculator

Solution

The fourth proportional to 589.20, 812.79 and 379.50 is: 523.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.20 : 812.79 = 379.50 : x
  2. Step 2: Convert to fraction form
    589.20/812.79 = 379.50/x
  3. Step 3: Cross multiply
    589.20x = 812.79 × 379.50
  4. Step 4: Simplify right side
    589.20x = 308,453.81
  5. Step 5: Solve for x
    x = 308,453.81/589.20
  6. Step 6: Final answer
    x = 523.51

Related Problems

Find fourth proportional to 294.60, 406.40 and 189.75
Half scale
Find fourth proportional to 1,178.40, 1,625.58 and 759
Double scale
Find fourth proportional to 590.20, 814.17 and 380.50
Similar ratio
Find fourth proportional to 883.80, 1,219.19 and 569.25
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.