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Finding the Fourth Proportional to 78,650.78, 117,979.13 and 21,730.46

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Solution

The fourth proportional to 78,650.78, 117,979.13 and 21,730.46 is: 32,596.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,650.78 : 117,979.13 = 21,730.46 : x
  2. Step 2: Convert to fraction form
    78,650.78/117,979.13 = 21,730.46/x
  3. Step 3: Cross multiply
    78,650.78x = 117,979.13 × 21,730.46
  4. Step 4: Simplify right side
    78,650.78x = 2,563,740,765.30
  5. Step 5: Solve for x
    x = 2,563,740,765.30/78,650.78
  6. Step 6: Final answer
    x = 32,596.51

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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.