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Finding the Fourth Proportional to 128,052.80, 191,906.40 and 91,073.60

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Solution

The fourth proportional to 128,052.80, 191,906.40 and 91,073.60 is: 136,487.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,052.80 : 191,906.40 = 91,073.60 : x
  2. Step 2: Convert to fraction form
    128,052.80/191,906.40 = 91,073.60/x
  3. Step 3: Cross multiply
    128,052.80x = 191,906.40 × 91,073.60
  4. Step 4: Simplify right side
    128,052.80x = 17,477,606,711.04
  5. Step 5: Solve for x
    x = 17,477,606,711.04/128,052.80
  6. Step 6: Final answer
    x = 136,487.50

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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.