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Finding the Fourth Proportional to 13,921.27, 20,871.98 and 6,521.69

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Solution

The fourth proportional to 13,921.27, 20,871.98 and 6,521.69 is: 9,777.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,921.27 : 20,871.98 = 6,521.69 : x
  2. Step 2: Convert to fraction form
    13,921.27/20,871.98 = 6,521.69/x
  3. Step 3: Cross multiply
    13,921.27x = 20,871.98 × 6,521.69
  4. Step 4: Simplify right side
    13,921.27x = 136,120,602.82
  5. Step 5: Solve for x
    x = 136,120,602.82/13,921.27
  6. Step 6: Final answer
    x = 9,777.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.