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Finding the Fourth Proportional to 13,290.60, 19,907.10 and 10,986.60

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Solution

The fourth proportional to 13,290.60, 19,907.10 and 10,986.60 is: 16,456.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,290.60 : 19,907.10 = 10,986.60 : x
  2. Step 2: Convert to fraction form
    13,290.60/19,907.10 = 10,986.60/x
  3. Step 3: Cross multiply
    13,290.60x = 19,907.10 × 10,986.60
  4. Step 4: Simplify right side
    13,290.60x = 218,711,344.86
  5. Step 5: Solve for x
    x = 218,711,344.86/13,290.60
  6. Step 6: Final answer
    x = 16,456.09

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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.