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Finding the Fourth Proportional to 7,929.34, 11,891.57 and 5,479.90

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Solution

The fourth proportional to 7,929.34, 11,891.57 and 5,479.90 is: 8,218.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,929.34 : 11,891.57 = 5,479.90 : x
  2. Step 2: Convert to fraction form
    7,929.34/11,891.57 = 5,479.90/x
  3. Step 3: Cross multiply
    7,929.34x = 11,891.57 × 5,479.90
  4. Step 4: Simplify right side
    7,929.34x = 65,164,614.44
  5. Step 5: Solve for x
    x = 65,164,614.44/7,929.34
  6. Step 6: Final answer
    x = 8,218.16

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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.