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Finding the Fourth Proportional to 21,138.56, 29,171.15 and 12,186.01

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Solution

The fourth proportional to 21,138.56, 29,171.15 and 12,186.01 is: 16,816.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.56 : 29,171.15 = 12,186.01 : x
  2. Step 2: Convert to fraction form
    21,138.56/29,171.15 = 12,186.01/x
  3. Step 3: Cross multiply
    21,138.56x = 29,171.15 × 12,186.01
  4. Step 4: Simplify right side
    21,138.56x = 355,479,925.61
  5. Step 5: Solve for x
    x = 355,479,925.61/21,138.56
  6. Step 6: Final answer
    x = 16,816.66

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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.