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Finding the Fourth Proportional to 12,139.14, 18,208.80 and 5,208.78

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Solution

The fourth proportional to 12,139.14, 18,208.80 and 5,208.78 is: 7,813.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.14 : 18,208.80 = 5,208.78 : x
  2. Step 2: Convert to fraction form
    12,139.14/18,208.80 = 5,208.78/x
  3. Step 3: Cross multiply
    12,139.14x = 18,208.80 × 5,208.78
  4. Step 4: Simplify right side
    12,139.14x = 94,845,633.26
  5. Step 5: Solve for x
    x = 94,845,633.26/12,139.14
  6. Step 6: Final answer
    x = 7,813.21

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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.