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Finding the Fourth Proportional to 203,788.88, 305,585.04 and 85,428.48

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Solution

The fourth proportional to 203,788.88, 305,585.04 and 85,428.48 is: 128,101.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,788.88 : 305,585.04 = 85,428.48 : x
  2. Step 2: Convert to fraction form
    203,788.88/305,585.04 = 85,428.48/x
  3. Step 3: Cross multiply
    203,788.88x = 305,585.04 × 85,428.48
  4. Step 4: Simplify right side
    203,788.88x = 26,105,665,477.94
  5. Step 5: Solve for x
    x = 26,105,665,477.94/203,788.88
  6. Step 6: Final answer
    x = 128,101.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.