Home / 7,317.72-10,978.20-3,420

Finding the Fourth Proportional to 7,317.72, 10,978.20 and 3,420

Calculator

Solution

The fourth proportional to 7,317.72, 10,978.20 and 3,420 is: 5,130.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,317.72 : 10,978.20 = 3,420 : x
  2. Step 2: Convert to fraction form
    7,317.72/10,978.20 = 3,420/x
  3. Step 3: Cross multiply
    7,317.72x = 10,978.20 × 3,420
  4. Step 4: Simplify right side
    7,317.72x = 37,545,444
  5. Step 5: Solve for x
    x = 37,545,444/7,317.72
  6. Step 6: Final answer
    x = 5,130.76

Related Problems

Find fourth proportional to 3,658.86, 5,489.10 and 1,710
Half scale
Find fourth proportional to 14,635.44, 21,956.40 and 6,840
Double scale
Find fourth proportional to 7,318.72, 10,979.70 and 3,421
Similar ratio
Find fourth proportional to 10,976.58, 16,467.30 and 5,130
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.