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Finding the Fourth Proportional to 10,909.80, 16,365.90 and 3,985.80

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Solution

The fourth proportional to 10,909.80, 16,365.90 and 3,985.80 is: 5,979.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,909.80 : 16,365.90 = 3,985.80 : x
  2. Step 2: Convert to fraction form
    10,909.80/16,365.90 = 3,985.80/x
  3. Step 3: Cross multiply
    10,909.80x = 16,365.90 × 3,985.80
  4. Step 4: Simplify right side
    10,909.80x = 65,231,204.22
  5. Step 5: Solve for x
    x = 65,231,204.22/10,909.80
  6. Step 6: Final answer
    x = 5,979.14

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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.