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Finding the Fourth Proportional to 128,515.78, 177,351.73 and 71,927.15

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Solution

The fourth proportional to 128,515.78, 177,351.73 and 71,927.15 is: 99,259.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,515.78 : 177,351.73 = 71,927.15 : x
  2. Step 2: Convert to fraction form
    128,515.78/177,351.73 = 71,927.15/x
  3. Step 3: Cross multiply
    128,515.78x = 177,351.73 × 71,927.15
  4. Step 4: Simplify right side
    128,515.78x = 12,756,404,486.47
  5. Step 5: Solve for x
    x = 12,756,404,486.47/128,515.78
  6. Step 6: Final answer
    x = 99,259.44

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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.