Home / 847.20-1,269.96-407.64

Finding the Fourth Proportional to 847.20, 1,269.96 and 407.64

Calculator

Solution

The fourth proportional to 847.20, 1,269.96 and 407.64 is: 611.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.20 : 1,269.96 = 407.64 : x
  2. Step 2: Convert to fraction form
    847.20/1,269.96 = 407.64/x
  3. Step 3: Cross multiply
    847.20x = 1,269.96 × 407.64
  4. Step 4: Simplify right side
    847.20x = 517,686.49
  5. Step 5: Solve for x
    x = 517,686.49/847.20
  6. Step 6: Final answer
    x = 611.06

Related Problems

Find fourth proportional to 423.60, 634.98 and 203.82
Half scale
Find fourth proportional to 1,694.40, 2,539.92 and 815.28
Double scale
Find fourth proportional to 848.20, 1,271.46 and 408.64
Similar ratio
Find fourth proportional to 1,270.80, 1,904.94 and 611.46
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.