Home / 535.71-739.09-378.61

Finding the Fourth Proportional to 535.71, 739.09 and 378.61

Calculator

Solution

The fourth proportional to 535.71, 739.09 and 378.61 is: 522.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.71 : 739.09 = 378.61 : x
  2. Step 2: Convert to fraction form
    535.71/739.09 = 378.61/x
  3. Step 3: Cross multiply
    535.71x = 739.09 × 378.61
  4. Step 4: Simplify right side
    535.71x = 279,827.01
  5. Step 5: Solve for x
    x = 279,827.01/535.71
  6. Step 6: Final answer
    x = 522.34

Related Problems

Find fourth proportional to 267.86, 369.54 and 189.31
Half scale
Find fourth proportional to 1,071.43, 1,478.17 and 757.22
Double scale
Find fourth proportional to 536.71, 740.47 and 379.61
Similar ratio
Find fourth proportional to 803.57, 1,108.63 and 567.92
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.