Home / 522.15-784.91-420.57

Finding the Fourth Proportional to 522.15, 784.91 and 420.57

Calculator

Solution

The fourth proportional to 522.15, 784.91 and 420.57 is: 632.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.15 : 784.91 = 420.57 : x
  2. Step 2: Convert to fraction form
    522.15/784.91 = 420.57/x
  3. Step 3: Cross multiply
    522.15x = 784.91 × 420.57
  4. Step 4: Simplify right side
    522.15x = 330,109.60
  5. Step 5: Solve for x
    x = 330,109.60/522.15
  6. Step 6: Final answer
    x = 632.21

Related Problems

Find fourth proportional to 261.08, 392.46 and 210.29
Half scale
Find fourth proportional to 1,044.30, 1,569.82 and 841.14
Double scale
Find fourth proportional to 523.15, 786.41 and 421.57
Similar ratio
Find fourth proportional to 783.23, 1,177.37 and 630.86
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.