Home / 11,515.07-15,890.13-6,479.49

Finding the Fourth Proportional to 11,515.07, 15,890.13 and 6,479.49

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Solution

The fourth proportional to 11,515.07, 15,890.13 and 6,479.49 is: 8,941.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,515.07 : 15,890.13 = 6,479.49 : x
  2. Step 2: Convert to fraction form
    11,515.07/15,890.13 = 6,479.49/x
  3. Step 3: Cross multiply
    11,515.07x = 15,890.13 × 6,479.49
  4. Step 4: Simplify right side
    11,515.07x = 102,959,938.43
  5. Step 5: Solve for x
    x = 102,959,938.43/11,515.07
  6. Step 6: Final answer
    x = 8,941.32

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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.