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Finding the Fourth Proportional to 13,137.90, 18,129.96 and 7,169.64

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Solution

The fourth proportional to 13,137.90, 18,129.96 and 7,169.64 is: 9,893.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.90 : 18,129.96 = 7,169.64 : x
  2. Step 2: Convert to fraction form
    13,137.90/18,129.96 = 7,169.64/x
  3. Step 3: Cross multiply
    13,137.90x = 18,129.96 × 7,169.64
  4. Step 4: Simplify right side
    13,137.90x = 129,985,286.41
  5. Step 5: Solve for x
    x = 129,985,286.41/13,137.90
  6. Step 6: Final answer
    x = 9,893.92

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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.