Home / 6,460-9,688-4,378.72

Finding the Fourth Proportional to 6,460, 9,688 and 4,378.72

Calculator

Solution

The fourth proportional to 6,460, 9,688 and 4,378.72 is: 6,566.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,460 : 9,688 = 4,378.72 : x
  2. Step 2: Convert to fraction form
    6,460/9,688 = 4,378.72/x
  3. Step 3: Cross multiply
    6,460x = 9,688 × 4,378.72
  4. Step 4: Simplify right side
    6,460x = 42,421,039.36
  5. Step 5: Solve for x
    x = 42,421,039.36/6,460
  6. Step 6: Final answer
    x = 6,566.72

Related Problems

Find fourth proportional to 3,230, 4,844 and 2,189.36
Half scale
Find fourth proportional to 12,920, 19,376 and 8,757.44
Double scale
Find fourth proportional to 6,461, 9,689.50 and 4,379.72
Similar ratio
Find fourth proportional to 9,690, 14,532 and 6,568.08
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.