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Finding the Fourth Proportional to 128,759.63, 177,699.22 and 72,181.94

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Solution

The fourth proportional to 128,759.63, 177,699.22 and 72,181.94 is: 99,617.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,759.63 : 177,699.22 = 72,181.94 : x
  2. Step 2: Convert to fraction form
    128,759.63/177,699.22 = 72,181.94/x
  3. Step 3: Cross multiply
    128,759.63x = 177,699.22 × 72,181.94
  4. Step 4: Simplify right side
    128,759.63x = 12,826,673,367.14
  5. Step 5: Solve for x
    x = 12,826,673,367.14/128,759.63
  6. Step 6: Final answer
    x = 99,617.20

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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.