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Finding the Fourth Proportional to 11,379.90, 15,713.96 and 7,138.10

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Solution

The fourth proportional to 11,379.90, 15,713.96 and 7,138.10 is: 9,856.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,379.90 : 15,713.96 = 7,138.10 : x
  2. Step 2: Convert to fraction form
    11,379.90/15,713.96 = 7,138.10/x
  3. Step 3: Cross multiply
    11,379.90x = 15,713.96 × 7,138.10
  4. Step 4: Simplify right side
    11,379.90x = 112,167,817.88
  5. Step 5: Solve for x
    x = 112,167,817.88/11,379.90
  6. Step 6: Final answer
    x = 9,856.66

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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.