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Finding the Fourth Proportional to 78,890.94, 118,310.85 and 26,286.30

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Solution

The fourth proportional to 78,890.94, 118,310.85 and 26,286.30 is: 39,420.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,890.94 : 118,310.85 = 26,286.30 : x
  2. Step 2: Convert to fraction form
    78,890.94/118,310.85 = 26,286.30/x
  3. Step 3: Cross multiply
    78,890.94x = 118,310.85 × 26,286.30
  4. Step 4: Simplify right side
    78,890.94x = 3,109,954,496.36
  5. Step 5: Solve for x
    x = 3,109,954,496.36/78,890.94
  6. Step 6: Final answer
    x = 39,420.93

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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.