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Finding the Fourth Proportional to 128,657.85, 192,987.22 and 91,104.34

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Solution

The fourth proportional to 128,657.85, 192,987.22 and 91,104.34 is: 136,656.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,657.85 : 192,987.22 = 91,104.34 : x
  2. Step 2: Convert to fraction form
    128,657.85/192,987.22 = 91,104.34/x
  3. Step 3: Cross multiply
    128,657.85x = 192,987.22 × 91,104.34
  4. Step 4: Simplify right side
    128,657.85x = 17,581,972,341.60
  5. Step 5: Solve for x
    x = 17,581,972,341.60/128,657.85
  6. Step 6: Final answer
    x = 136,656.82

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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.