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Finding the Fourth Proportional to 128,535.60, 192,803.40 and 91,137.90

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Solution

The fourth proportional to 128,535.60, 192,803.40 and 91,137.90 is: 136,706.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,535.60 : 192,803.40 = 91,137.90 : x
  2. Step 2: Convert to fraction form
    128,535.60/192,803.40 = 91,137.90/x
  3. Step 3: Cross multiply
    128,535.60x = 192,803.40 × 91,137.90
  4. Step 4: Simplify right side
    128,535.60x = 17,571,696,988.86
  5. Step 5: Solve for x
    x = 17,571,696,988.86/128,535.60
  6. Step 6: Final answer
    x = 136,706.85

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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.