Home / 1,215.75-1,680-994.62

Finding the Fourth Proportional to 1,215.75, 1,680 and 994.62

Calculator

Solution

The fourth proportional to 1,215.75, 1,680 and 994.62 is: 1,374.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.75 : 1,680 = 994.62 : x
  2. Step 2: Convert to fraction form
    1,215.75/1,680 = 994.62/x
  3. Step 3: Cross multiply
    1,215.75x = 1,680 × 994.62
  4. Step 4: Simplify right side
    1,215.75x = 1,670,961.60
  5. Step 5: Solve for x
    x = 1,670,961.60/1,215.75
  6. Step 6: Final answer
    x = 1,374.43

Related Problems

Find fourth proportional to 607.88, 840 and 497.31
Half scale
Find fourth proportional to 2,431.50, 3,360 and 1,989.24
Double scale
Find fourth proportional to 1,216.75, 1,681.38 and 995.62
Similar ratio
Find fourth proportional to 1,823.63, 2,520 and 1,491.93
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.