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Finding the Fourth Proportional to 21,089.51, 31,634.24 and 8,615.39

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Solution

The fourth proportional to 21,089.51, 31,634.24 and 8,615.39 is: 12,923.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,089.51 : 31,634.24 = 8,615.39 : x
  2. Step 2: Convert to fraction form
    21,089.51/31,634.24 = 8,615.39/x
  3. Step 3: Cross multiply
    21,089.51x = 31,634.24 × 8,615.39
  4. Step 4: Simplify right side
    21,089.51x = 272,541,350.96
  5. Step 5: Solve for x
    x = 272,541,350.96/21,089.51
  6. Step 6: Final answer
    x = 12,923.08

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