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Finding the Fourth Proportional to 128,802.88, 177,791.68 and 81,136

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Solution

The fourth proportional to 128,802.88, 177,791.68 and 81,136 is: 111,995.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,802.88 : 177,791.68 = 81,136 : x
  2. Step 2: Convert to fraction form
    128,802.88/177,791.68 = 81,136/x
  3. Step 3: Cross multiply
    128,802.88x = 177,791.68 × 81,136
  4. Step 4: Simplify right side
    128,802.88x = 14,425,305,748.48
  5. Step 5: Solve for x
    x = 14,425,305,748.48/128,802.88
  6. Step 6: Final answer
    x = 111,995.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.