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Finding the Fourth Proportional to 128,741.10, 193,134.03 and 43,343.85

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Solution

The fourth proportional to 128,741.10, 193,134.03 and 43,343.85 is: 65,023.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,741.10 : 193,134.03 = 43,343.85 : x
  2. Step 2: Convert to fraction form
    128,741.10/193,134.03 = 43,343.85/x
  3. Step 3: Cross multiply
    128,741.10x = 193,134.03 × 43,343.85
  4. Step 4: Simplify right side
    128,741.10x = 8,371,172,426.22
  5. Step 5: Solve for x
    x = 8,371,172,426.22/128,741.10
  6. Step 6: Final answer
    x = 65,023.31

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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.