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Finding the Fourth Proportional to 8,618.90, 12,929.09 and 2,378.91

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Solution

The fourth proportional to 8,618.90, 12,929.09 and 2,378.91 is: 3,568.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,618.90 : 12,929.09 = 2,378.91 : x
  2. Step 2: Convert to fraction form
    8,618.90/12,929.09 = 2,378.91/x
  3. Step 3: Cross multiply
    8,618.90x = 12,929.09 × 2,378.91
  4. Step 4: Simplify right side
    8,618.90x = 30,757,151.75
  5. Step 5: Solve for x
    x = 30,757,151.75/8,618.90
  6. Step 6: Final answer
    x = 3,568.57

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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.