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Finding the Fourth Proportional to 138,690.42, 191,392.12 and 75,027.66

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Solution

The fourth proportional to 138,690.42, 191,392.12 and 75,027.66 is: 103,537.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,690.42 : 191,392.12 = 75,027.66 : x
  2. Step 2: Convert to fraction form
    138,690.42/191,392.12 = 75,027.66/x
  3. Step 3: Cross multiply
    138,690.42x = 191,392.12 × 75,027.66
  4. Step 4: Simplify right side
    138,690.42x = 14,359,702,906.04
  5. Step 5: Solve for x
    x = 14,359,702,906.04/138,690.42
  6. Step 6: Final answer
    x = 103,537.81

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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.