Home / 847.86-1,270.39-815.87

Finding the Fourth Proportional to 847.86, 1,270.39 and 815.87

Calculator

Solution

The fourth proportional to 847.86, 1,270.39 and 815.87 is: 1,222.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.86 : 1,270.39 = 815.87 : x
  2. Step 2: Convert to fraction form
    847.86/1,270.39 = 815.87/x
  3. Step 3: Cross multiply
    847.86x = 1,270.39 × 815.87
  4. Step 4: Simplify right side
    847.86x = 1,036,473.09
  5. Step 5: Solve for x
    x = 1,036,473.09/847.86
  6. Step 6: Final answer
    x = 1,222.46

Related Problems

Find fourth proportional to 423.93, 635.20 and 407.94
Half scale
Find fourth proportional to 1,695.72, 2,540.78 and 1,631.74
Double scale
Find fourth proportional to 848.86, 1,271.89 and 816.87
Similar ratio
Find fourth proportional to 1,271.79, 1,905.59 and 1,223.81
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.