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Finding the Fourth Proportional to 13,655.86, 18,845.08 and 7,991.70

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Solution

The fourth proportional to 13,655.86, 18,845.08 and 7,991.70 is: 11,028.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,655.86 : 18,845.08 = 7,991.70 : x
  2. Step 2: Convert to fraction form
    13,655.86/18,845.08 = 7,991.70/x
  3. Step 3: Cross multiply
    13,655.86x = 18,845.08 × 7,991.70
  4. Step 4: Simplify right side
    13,655.86x = 150,604,135.19
  5. Step 5: Solve for x
    x = 150,604,135.19/13,655.86
  6. Step 6: Final answer
    x = 11,028.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.