Home / 569.40-785.64-320.72

Finding the Fourth Proportional to 569.40, 785.64 and 320.72

Calculator

Solution

The fourth proportional to 569.40, 785.64 and 320.72 is: 442.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.40 : 785.64 = 320.72 : x
  2. Step 2: Convert to fraction form
    569.40/785.64 = 320.72/x
  3. Step 3: Cross multiply
    569.40x = 785.64 × 320.72
  4. Step 4: Simplify right side
    569.40x = 251,973.01
  5. Step 5: Solve for x
    x = 251,973.01/569.40
  6. Step 6: Final answer
    x = 442.52

Related Problems

Find fourth proportional to 284.70, 392.82 and 160.36
Half scale
Find fourth proportional to 1,138.81, 1,571.28 and 641.45
Double scale
Find fourth proportional to 570.40, 787.02 and 321.72
Similar ratio
Find fourth proportional to 854.11, 1,178.46 and 481.09
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.