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Finding the Fourth Proportional to 85,418.38, 128,114.40 and 29,245.60

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Solution

The fourth proportional to 85,418.38, 128,114.40 and 29,245.60 is: 43,863.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,418.38 : 128,114.40 = 29,245.60 : x
  2. Step 2: Convert to fraction form
    85,418.38/128,114.40 = 29,245.60/x
  3. Step 3: Cross multiply
    85,418.38x = 128,114.40 × 29,245.60
  4. Step 4: Simplify right side
    85,418.38x = 3,746,782,496.64
  5. Step 5: Solve for x
    x = 3,746,782,496.64/85,418.38
  6. Step 6: Final answer
    x = 43,863.89

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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.