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Finding the Fourth Proportional to 12,907.60, 19,375.80 and 12,061.60

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Solution

The fourth proportional to 12,907.60, 19,375.80 and 12,061.60 is: 18,105.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,907.60 : 19,375.80 = 12,061.60 : x
  2. Step 2: Convert to fraction form
    12,907.60/19,375.80 = 12,061.60/x
  3. Step 3: Cross multiply
    12,907.60x = 19,375.80 × 12,061.60
  4. Step 4: Simplify right side
    12,907.60x = 233,703,149.28
  5. Step 5: Solve for x
    x = 233,703,149.28/12,907.60
  6. Step 6: Final answer
    x = 18,105.86

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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.