Home / 529.20-730.35-381.78

Finding the Fourth Proportional to 529.20, 730.35 and 381.78

Calculator

Solution

The fourth proportional to 529.20, 730.35 and 381.78 is: 526.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.20 : 730.35 = 381.78 : x
  2. Step 2: Convert to fraction form
    529.20/730.35 = 381.78/x
  3. Step 3: Cross multiply
    529.20x = 730.35 × 381.78
  4. Step 4: Simplify right side
    529.20x = 278,833.02
  5. Step 5: Solve for x
    x = 278,833.02/529.20
  6. Step 6: Final answer
    x = 526.90

Related Problems

Find fourth proportional to 264.60, 365.18 and 190.89
Half scale
Find fourth proportional to 1,058.40, 1,460.70 and 763.56
Double scale
Find fourth proportional to 530.20, 731.73 and 382.78
Similar ratio
Find fourth proportional to 793.80, 1,095.53 and 572.67
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.