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Finding the Fourth Proportional to 74,876, 103,244.64 and 61,221.44

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Solution

The fourth proportional to 74,876, 103,244.64 and 61,221.44 is: 84,416.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,876 : 103,244.64 = 61,221.44 : x
  2. Step 2: Convert to fraction form
    74,876/103,244.64 = 61,221.44/x
  3. Step 3: Cross multiply
    74,876x = 103,244.64 × 61,221.44
  4. Step 4: Simplify right side
    74,876x = 6,320,785,533.08
  5. Step 5: Solve for x
    x = 6,320,785,533.08/74,876
  6. Step 6: Final answer
    x = 84,416.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.