Home / 11,515.10-15,890.85-6,479.60

Finding the Fourth Proportional to 11,515.10, 15,890.85 and 6,479.60

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Solution

The fourth proportional to 11,515.10, 15,890.85 and 6,479.60 is: 8,941.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,515.10 : 15,890.85 = 6,479.60 : x
  2. Step 2: Convert to fraction form
    11,515.10/15,890.85 = 6,479.60/x
  3. Step 3: Cross multiply
    11,515.10x = 15,890.85 × 6,479.60
  4. Step 4: Simplify right side
    11,515.10x = 102,966,272.21
  5. Step 5: Solve for x
    x = 102,966,272.21/11,515.10
  6. Step 6: Final answer
    x = 8,941.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.