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Finding the Fourth Proportional to 13,447.70, 20,171.55 and 9,991.70

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Solution

The fourth proportional to 13,447.70, 20,171.55 and 9,991.70 is: 14,987.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,447.70 : 20,171.55 = 9,991.70 : x
  2. Step 2: Convert to fraction form
    13,447.70/20,171.55 = 9,991.70/x
  3. Step 3: Cross multiply
    13,447.70x = 20,171.55 × 9,991.70
  4. Step 4: Simplify right side
    13,447.70x = 201,548,076.14
  5. Step 5: Solve for x
    x = 201,548,076.14/13,447.70
  6. Step 6: Final answer
    x = 14,987.55

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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.