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Finding the Fourth Proportional to 8,620, 12,926.81 and 3,071.88

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Solution

The fourth proportional to 8,620, 12,926.81 and 3,071.88 is: 4,606.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620 : 12,926.81 = 3,071.88 : x
  2. Step 2: Convert to fraction form
    8,620/12,926.81 = 3,071.88/x
  3. Step 3: Cross multiply
    8,620x = 12,926.81 × 3,071.88
  4. Step 4: Simplify right side
    8,620x = 39,709,609.10
  5. Step 5: Solve for x
    x = 39,709,609.10/8,620
  6. Step 6: Final answer
    x = 4,606.68

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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.