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Finding the Fourth Proportional to 128,788.82, 177,814.86 and 80,464.31

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Solution

The fourth proportional to 128,788.82, 177,814.86 and 80,464.31 is: 111,094.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,788.82 : 177,814.86 = 80,464.31 : x
  2. Step 2: Convert to fraction form
    128,788.82/177,814.86 = 80,464.31/x
  3. Step 3: Cross multiply
    128,788.82x = 177,814.86 × 80,464.31
  4. Step 4: Simplify right side
    128,788.82x = 14,307,750,017.65
  5. Step 5: Solve for x
    x = 14,307,750,017.65/128,788.82
  6. Step 6: Final answer
    x = 111,094.66

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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.