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Finding the Fourth Proportional to 128,657.35, 192,986.47 and 91,103.84

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Solution

The fourth proportional to 128,657.35, 192,986.47 and 91,103.84 is: 136,656.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,657.35 : 192,986.47 = 91,103.84 : x
  2. Step 2: Convert to fraction form
    128,657.35/192,986.47 = 91,103.84/x
  3. Step 3: Cross multiply
    128,657.35x = 192,986.47 × 91,103.84
  4. Step 4: Simplify right side
    128,657.35x = 17,581,807,520.11
  5. Step 5: Solve for x
    x = 17,581,807,520.11/128,657.35
  6. Step 6: Final answer
    x = 136,656.07

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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.