Home / 857-1,182.82-489

Finding the Fourth Proportional to 857, 1,182.82 and 489

Calculator

Solution

The fourth proportional to 857, 1,182.82 and 489 is: 674.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    857 : 1,182.82 = 489 : x
  2. Step 2: Convert to fraction form
    857/1,182.82 = 489/x
  3. Step 3: Cross multiply
    857x = 1,182.82 × 489
  4. Step 4: Simplify right side
    857x = 578,398.98
  5. Step 5: Solve for x
    x = 578,398.98/857
  6. Step 6: Final answer
    x = 674.91

Related Problems

Find fourth proportional to 428.50, 591.41 and 244.50
Half scale
Find fourth proportional to 1,714, 2,365.64 and 978
Double scale
Find fourth proportional to 858, 1,184.20 and 490
Similar ratio
Find fourth proportional to 1,285.50, 1,774.23 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.