Home / 985.71-1,478.56-292.39

Finding the Fourth Proportional to 985.71, 1,478.56 and 292.39

Calculator

Solution

The fourth proportional to 985.71, 1,478.56 and 292.39 is: 438.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.71 : 1,478.56 = 292.39 : x
  2. Step 2: Convert to fraction form
    985.71/1,478.56 = 292.39/x
  3. Step 3: Cross multiply
    985.71x = 1,478.56 × 292.39
  4. Step 4: Simplify right side
    985.71x = 432,316.16
  5. Step 5: Solve for x
    x = 432,316.16/985.71
  6. Step 6: Final answer
    x = 438.58

Related Problems

Find fourth proportional to 492.86, 739.28 and 146.20
Half scale
Find fourth proportional to 1,971.42, 2,957.12 and 584.78
Double scale
Find fourth proportional to 986.71, 1,480.06 and 293.39
Similar ratio
Find fourth proportional to 1,478.57, 2,217.84 and 438.59
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.