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Finding the Fourth Proportional to 21,645.78, 29,871.65 and 11,955.21

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Solution

The fourth proportional to 21,645.78, 29,871.65 and 11,955.21 is: 16,498.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,645.78 : 29,871.65 = 11,955.21 : x
  2. Step 2: Convert to fraction form
    21,645.78/29,871.65 = 11,955.21/x
  3. Step 3: Cross multiply
    21,645.78x = 29,871.65 × 11,955.21
  4. Step 4: Simplify right side
    21,645.78x = 357,121,789.02
  5. Step 5: Solve for x
    x = 357,121,789.02/21,645.78
  6. Step 6: Final answer
    x = 16,498.45

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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.