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Finding the Fourth Proportional to 128,049.60, 192,074.40 and 90,651.90

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Solution

The fourth proportional to 128,049.60, 192,074.40 and 90,651.90 is: 135,977.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,049.60 : 192,074.40 = 90,651.90 : x
  2. Step 2: Convert to fraction form
    128,049.60/192,074.40 = 90,651.90/x
  3. Step 3: Cross multiply
    128,049.60x = 192,074.40 × 90,651.90
  4. Step 4: Simplify right side
    128,049.60x = 17,411,909,301.36
  5. Step 5: Solve for x
    x = 17,411,909,301.36/128,049.60
  6. Step 6: Final answer
    x = 135,977.85

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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.