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Finding the Fourth Proportional to 28,104, 38,781.79 and 15,354.60

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Solution

The fourth proportional to 28,104, 38,781.79 and 15,354.60 is: 21,188.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,104 : 38,781.79 = 15,354.60 : x
  2. Step 2: Convert to fraction form
    28,104/38,781.79 = 15,354.60/x
  3. Step 3: Cross multiply
    28,104x = 38,781.79 × 15,354.60
  4. Step 4: Simplify right side
    28,104x = 595,478,872.73
  5. Step 5: Solve for x
    x = 595,478,872.73/28,104
  6. Step 6: Final answer
    x = 21,188.40

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Why These Related Problems?

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