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Finding the Fourth Proportional to 12,807.80, 19,211.70 and 11,896.55

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Solution

The fourth proportional to 12,807.80, 19,211.70 and 11,896.55 is: 17,844.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,807.80 : 19,211.70 = 11,896.55 : x
  2. Step 2: Convert to fraction form
    12,807.80/19,211.70 = 11,896.55/x
  3. Step 3: Cross multiply
    12,807.80x = 19,211.70 × 11,896.55
  4. Step 4: Simplify right side
    12,807.80x = 228,552,949.64
  5. Step 5: Solve for x
    x = 228,552,949.64/12,807.80
  6. Step 6: Final answer
    x = 17,844.83

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1.5x scale

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.