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Finding the Fourth Proportional to 128,628.60, 193,008.75 and 61,236.87

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Solution

The fourth proportional to 128,628.60, 193,008.75 and 61,236.87 is: 91,886.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,628.60 : 193,008.75 = 61,236.87 : x
  2. Step 2: Convert to fraction form
    128,628.60/193,008.75 = 61,236.87/x
  3. Step 3: Cross multiply
    128,628.60x = 193,008.75 × 61,236.87
  4. Step 4: Simplify right side
    128,628.60x = 11,819,251,732.61
  5. Step 5: Solve for x
    x = 11,819,251,732.61/128,628.60
  6. Step 6: Final answer
    x = 91,886.65

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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.