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Finding the Fourth Proportional to 21,303.27, 29,399.81 and 11,871.81

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Solution

The fourth proportional to 21,303.27, 29,399.81 and 11,871.81 is: 16,383.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,303.27 : 29,399.81 = 11,871.81 : x
  2. Step 2: Convert to fraction form
    21,303.27/29,399.81 = 11,871.81/x
  3. Step 3: Cross multiply
    21,303.27x = 29,399.81 × 11,871.81
  4. Step 4: Simplify right side
    21,303.27x = 349,028,899.00
  5. Step 5: Solve for x
    x = 349,028,899.00/21,303.27
  6. Step 6: Final answer
    x = 16,383.82

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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.