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Finding the Fourth Proportional to 13,889.76, 19,162.80 and 7,921.12

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Solution

The fourth proportional to 13,889.76, 19,162.80 and 7,921.12 is: 10,928.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,889.76 : 19,162.80 = 7,921.12 : x
  2. Step 2: Convert to fraction form
    13,889.76/19,162.80 = 7,921.12/x
  3. Step 3: Cross multiply
    13,889.76x = 19,162.80 × 7,921.12
  4. Step 4: Simplify right side
    13,889.76x = 151,790,838.34
  5. Step 5: Solve for x
    x = 151,790,838.34/13,889.76
  6. Step 6: Final answer
    x = 10,928.25

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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.