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Finding the Fourth Proportional to 85,579.60, 128,023.80 and 74,021.20

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Solution

The fourth proportional to 85,579.60, 128,023.80 and 74,021.20 is: 110,732.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,579.60 : 128,023.80 = 74,021.20 : x
  2. Step 2: Convert to fraction form
    85,579.60/128,023.80 = 74,021.20/x
  3. Step 3: Cross multiply
    85,579.60x = 128,023.80 × 74,021.20
  4. Step 4: Simplify right side
    85,579.60x = 9,476,475,304.56
  5. Step 5: Solve for x
    x = 9,476,475,304.56/85,579.60
  6. Step 6: Final answer
    x = 110,732.88

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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.