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Finding the Fourth Proportional to 78,626.45, 117,868.82 and 28,671.49

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Solution

The fourth proportional to 78,626.45, 117,868.82 and 28,671.49 is: 42,981.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,626.45 : 117,868.82 = 28,671.49 : x
  2. Step 2: Convert to fraction form
    78,626.45/117,868.82 = 28,671.49/x
  3. Step 3: Cross multiply
    78,626.45x = 117,868.82 × 28,671.49
  4. Step 4: Simplify right side
    78,626.45x = 3,379,475,190.70
  5. Step 5: Solve for x
    x = 3,379,475,190.70/78,626.45
  6. Step 6: Final answer
    x = 42,981.41

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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.