Home / 1,086.44-1,629.90-509

Finding the Fourth Proportional to 1,086.44, 1,629.90 and 509

Calculator

Solution

The fourth proportional to 1,086.44, 1,629.90 and 509 is: 763.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.44 : 1,629.90 = 509 : x
  2. Step 2: Convert to fraction form
    1,086.44/1,629.90 = 509/x
  3. Step 3: Cross multiply
    1,086.44x = 1,629.90 × 509
  4. Step 4: Simplify right side
    1,086.44x = 829,619.10
  5. Step 5: Solve for x
    x = 829,619.10/1,086.44
  6. Step 6: Final answer
    x = 763.61

Related Problems

Find fourth proportional to 543.22, 814.95 and 254.50
Half scale
Find fourth proportional to 2,172.88, 3,259.80 and 1,018
Double scale
Find fourth proportional to 1,087.44, 1,631.40 and 510
Similar ratio
Find fourth proportional to 1,629.66, 2,444.85 and 763.50
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.