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Finding the Fourth Proportional to 28,161, 42,225.10 and 12,365.39

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Solution

The fourth proportional to 28,161, 42,225.10 and 12,365.39 is: 18,540.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,161 : 42,225.10 = 12,365.39 : x
  2. Step 2: Convert to fraction form
    28,161/42,225.10 = 12,365.39/x
  3. Step 3: Cross multiply
    28,161x = 42,225.10 × 12,365.39
  4. Step 4: Simplify right side
    28,161x = 522,129,903.94
  5. Step 5: Solve for x
    x = 522,129,903.94/28,161
  6. Step 6: Final answer
    x = 18,540.89

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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.