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Finding the Fourth Proportional to 78,708.56, 118,064.28 and 28,788.62

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Solution

The fourth proportional to 78,708.56, 118,064.28 and 28,788.62 is: 43,183.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,708.56 : 118,064.28 = 28,788.62 : x
  2. Step 2: Convert to fraction form
    78,708.56/118,064.28 = 28,788.62/x
  3. Step 3: Cross multiply
    78,708.56x = 118,064.28 × 28,788.62
  4. Step 4: Simplify right side
    78,708.56x = 3,398,907,692.49
  5. Step 5: Solve for x
    x = 3,398,907,692.49/78,708.56
  6. Step 6: Final answer
    x = 43,183.46

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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.