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Finding the Fourth Proportional to 128,672.70, 193,009.05 and 35,187.90

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Solution

The fourth proportional to 128,672.70, 193,009.05 and 35,187.90 is: 52,781.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,672.70 : 193,009.05 = 35,187.90 : x
  2. Step 2: Convert to fraction form
    128,672.70/193,009.05 = 35,187.90/x
  3. Step 3: Cross multiply
    128,672.70x = 193,009.05 × 35,187.90
  4. Step 4: Simplify right side
    128,672.70x = 6,791,583,150.50
  5. Step 5: Solve for x
    x = 6,791,583,150.50/128,672.70
  6. Step 6: Final answer
    x = 52,781.85

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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.