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Finding the Fourth Proportional to 21,005.39, 28,987.40 and 11,573.96

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Solution

The fourth proportional to 21,005.39, 28,987.40 and 11,573.96 is: 15,972.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.39 : 28,987.40 = 11,573.96 : x
  2. Step 2: Convert to fraction form
    21,005.39/28,987.40 = 11,573.96/x
  3. Step 3: Cross multiply
    21,005.39x = 28,987.40 × 11,573.96
  4. Step 4: Simplify right side
    21,005.39x = 335,498,892.10
  5. Step 5: Solve for x
    x = 335,498,892.10/21,005.39
  6. Step 6: Final answer
    x = 15,972.04

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.