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Finding the Fourth Proportional to 79,077.60, 118,443.60 and 61,408.80

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Solution

The fourth proportional to 79,077.60, 118,443.60 and 61,408.80 is: 91,979.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,077.60 : 118,443.60 = 61,408.80 : x
  2. Step 2: Convert to fraction form
    79,077.60/118,443.60 = 61,408.80/x
  3. Step 3: Cross multiply
    79,077.60x = 118,443.60 × 61,408.80
  4. Step 4: Simplify right side
    79,077.60x = 7,273,479,343.68
  5. Step 5: Solve for x
    x = 7,273,479,343.68/79,077.60
  6. Step 6: Final answer
    x = 91,979.01

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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.