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Finding the Fourth Proportional to 128,668.55, 192,789.40 and 91,042.11

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Solution

The fourth proportional to 128,668.55, 192,789.40 and 91,042.11 is: 136,412.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,668.55 : 192,789.40 = 91,042.11 : x
  2. Step 2: Convert to fraction form
    128,668.55/192,789.40 = 91,042.11/x
  3. Step 3: Cross multiply
    128,668.55x = 192,789.40 × 91,042.11
  4. Step 4: Simplify right side
    128,668.55x = 17,551,953,761.63
  5. Step 5: Solve for x
    x = 17,551,953,761.63/128,668.55
  6. Step 6: Final answer
    x = 136,412.15

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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.