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Finding the Fourth Proportional to 8,540, 11,785.20 and 4,814

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Solution

The fourth proportional to 8,540, 11,785.20 and 4,814 is: 6,643.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,540 : 11,785.20 = 4,814 : x
  2. Step 2: Convert to fraction form
    8,540/11,785.20 = 4,814/x
  3. Step 3: Cross multiply
    8,540x = 11,785.20 × 4,814
  4. Step 4: Simplify right side
    8,540x = 56,733,952.80
  5. Step 5: Solve for x
    x = 56,733,952.80/8,540
  6. Step 6: Final answer
    x = 6,643.32

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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.