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Finding the Fourth Proportional to 12,992.60, 19,490.10 and 5,199.80

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Solution

The fourth proportional to 12,992.60, 19,490.10 and 5,199.80 is: 7,800.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,992.60 : 19,490.10 = 5,199.80 : x
  2. Step 2: Convert to fraction form
    12,992.60/19,490.10 = 5,199.80/x
  3. Step 3: Cross multiply
    12,992.60x = 19,490.10 × 5,199.80
  4. Step 4: Simplify right side
    12,992.60x = 101,344,621.98
  5. Step 5: Solve for x
    x = 101,344,621.98/12,992.60
  6. Step 6: Final answer
    x = 7,800.18

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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.