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Finding the Fourth Proportional to 13,889.92, 19,167.87 and 7,921.67

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Solution

The fourth proportional to 13,889.92, 19,167.87 and 7,921.67 is: 10,931.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,889.92 : 19,167.87 = 7,921.67 : x
  2. Step 2: Convert to fraction form
    13,889.92/19,167.87 = 7,921.67/x
  3. Step 3: Cross multiply
    13,889.92x = 19,167.87 × 7,921.67
  4. Step 4: Simplify right side
    13,889.92x = 151,841,540.74
  5. Step 5: Solve for x
    x = 151,841,540.74/13,889.92
  6. Step 6: Final answer
    x = 10,931.78

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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.