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Finding the Fourth Proportional to 78,621.62, 117,893.54 and 28,699.70

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Solution

The fourth proportional to 78,621.62, 117,893.54 and 28,699.70 is: 43,035.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,621.62 : 117,893.54 = 28,699.70 : x
  2. Step 2: Convert to fraction form
    78,621.62/117,893.54 = 28,699.70/x
  3. Step 3: Cross multiply
    78,621.62x = 117,893.54 × 28,699.70
  4. Step 4: Simplify right side
    78,621.62x = 3,383,509,229.94
  5. Step 5: Solve for x
    x = 3,383,509,229.94/78,621.62
  6. Step 6: Final answer
    x = 43,035.35

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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.