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Finding the Fourth Proportional to 19,212.61, 28,827.81 and 8,121.88

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Solution

The fourth proportional to 19,212.61, 28,827.81 and 8,121.88 is: 12,186.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,212.61 : 28,827.81 = 8,121.88 : x
  2. Step 2: Convert to fraction form
    19,212.61/28,827.81 = 8,121.88/x
  3. Step 3: Cross multiply
    19,212.61x = 28,827.81 × 8,121.88
  4. Step 4: Simplify right side
    19,212.61x = 234,136,013.48
  5. Step 5: Solve for x
    x = 234,136,013.48/19,212.61
  6. Step 6: Final answer
    x = 12,186.58

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Why These Related Problems?

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