Home / 11,515.12-15,890.52-6,479.62

Finding the Fourth Proportional to 11,515.12, 15,890.52 and 6,479.62

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Solution

The fourth proportional to 11,515.12, 15,890.52 and 6,479.62 is: 8,941.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,515.12 : 15,890.52 = 6,479.62 : x
  2. Step 2: Convert to fraction form
    11,515.12/15,890.52 = 6,479.62/x
  3. Step 3: Cross multiply
    11,515.12x = 15,890.52 × 6,479.62
  4. Step 4: Simplify right side
    11,515.12x = 102,964,531.20
  5. Step 5: Solve for x
    x = 102,964,531.20/11,515.12
  6. Step 6: Final answer
    x = 8,941.68

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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.