Home / 466.34-643.50-279.80

Finding the Fourth Proportional to 466.34, 643.50 and 279.80

Calculator

Solution

The fourth proportional to 466.34, 643.50 and 279.80 is: 386.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.34 : 643.50 = 279.80 : x
  2. Step 2: Convert to fraction form
    466.34/643.50 = 279.80/x
  3. Step 3: Cross multiply
    466.34x = 643.50 × 279.80
  4. Step 4: Simplify right side
    466.34x = 180,051.30
  5. Step 5: Solve for x
    x = 180,051.30/466.34
  6. Step 6: Final answer
    x = 386.09

Related Problems

Find fourth proportional to 233.17, 321.75 and 139.90
Half scale
Find fourth proportional to 932.68, 1,287 and 559.60
Double scale
Find fourth proportional to 467.34, 644.88 and 280.80
Similar ratio
Find fourth proportional to 699.51, 965.25 and 419.70
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.