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Finding the Fourth Proportional to 78,810.60, 118,043.10 and 68,442.60

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Solution

The fourth proportional to 78,810.60, 118,043.10 and 68,442.60 is: 102,513.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,810.60 : 118,043.10 = 68,442.60 : x
  2. Step 2: Convert to fraction form
    78,810.60/118,043.10 = 68,442.60/x
  3. Step 3: Cross multiply
    78,810.60x = 118,043.10 × 68,442.60
  4. Step 4: Simplify right side
    78,810.60x = 8,079,176,676.06
  5. Step 5: Solve for x
    x = 8,079,176,676.06/78,810.60
  6. Step 6: Final answer
    x = 102,513.83

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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.