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Finding the Fourth Proportional to 7,138.56, 9,837.92 and 5,145.76

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Solution

The fourth proportional to 7,138.56, 9,837.92 and 5,145.76 is: 7,091.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.56 : 9,837.92 = 5,145.76 : x
  2. Step 2: Convert to fraction form
    7,138.56/9,837.92 = 5,145.76/x
  3. Step 3: Cross multiply
    7,138.56x = 9,837.92 × 5,145.76
  4. Step 4: Simplify right side
    7,138.56x = 50,623,575.22
  5. Step 5: Solve for x
    x = 50,623,575.22/7,138.56
  6. Step 6: Final answer
    x = 7,091.57

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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.