Home / 862-1,189.56-489

Finding the Fourth Proportional to 862, 1,189.56 and 489

Calculator

Solution

The fourth proportional to 862, 1,189.56 and 489 is: 674.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    862 : 1,189.56 = 489 : x
  2. Step 2: Convert to fraction form
    862/1,189.56 = 489/x
  3. Step 3: Cross multiply
    862x = 1,189.56 × 489
  4. Step 4: Simplify right side
    862x = 581,694.84
  5. Step 5: Solve for x
    x = 581,694.84/862
  6. Step 6: Final answer
    x = 674.82

Related Problems

Find fourth proportional to 431, 594.78 and 244.50
Half scale
Find fourth proportional to 1,724, 2,379.12 and 978
Double scale
Find fourth proportional to 863, 1,190.94 and 490
Similar ratio
Find fourth proportional to 1,293, 1,784.34 and 733.50
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.