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Finding the Fourth Proportional to 78,212.70, 117,319.05 and 25,623.90

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Solution

The fourth proportional to 78,212.70, 117,319.05 and 25,623.90 is: 38,435.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,212.70 : 117,319.05 = 25,623.90 : x
  2. Step 2: Convert to fraction form
    78,212.70/117,319.05 = 25,623.90/x
  3. Step 3: Cross multiply
    78,212.70x = 117,319.05 × 25,623.90
  4. Step 4: Simplify right side
    78,212.70x = 3,006,171,605.30
  5. Step 5: Solve for x
    x = 3,006,171,605.30/78,212.70
  6. Step 6: Final answer
    x = 38,435.85

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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.