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Finding the Fourth Proportional to 223,687.36, 308,695.82 and 128,212.05

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Solution

The fourth proportional to 223,687.36, 308,695.82 and 128,212.05 is: 176,936.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,687.36 : 308,695.82 = 128,212.05 : x
  2. Step 2: Convert to fraction form
    223,687.36/308,695.82 = 128,212.05/x
  3. Step 3: Cross multiply
    223,687.36x = 308,695.82 × 128,212.05
  4. Step 4: Simplify right side
    223,687.36x = 39,578,523,908.63
  5. Step 5: Solve for x
    x = 39,578,523,908.63/223,687.36
  6. Step 6: Final answer
    x = 176,936.79

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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.