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Finding the Fourth Proportional to 7,988.67, 11,980.95 and 3,309.99

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Solution

The fourth proportional to 7,988.67, 11,980.95 and 3,309.99 is: 4,964.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,988.67 : 11,980.95 = 3,309.99 : x
  2. Step 2: Convert to fraction form
    7,988.67/11,980.95 = 3,309.99/x
  3. Step 3: Cross multiply
    7,988.67x = 11,980.95 × 3,309.99
  4. Step 4: Simplify right side
    7,988.67x = 39,656,824.69
  5. Step 5: Solve for x
    x = 39,656,824.69/7,988.67
  6. Step 6: Final answer
    x = 4,964.13

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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.