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Finding the Fourth Proportional to 100,687.85, 138,958.08 and 55,373.81

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Solution

The fourth proportional to 100,687.85, 138,958.08 and 55,373.81 is: 76,420.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,687.85 : 138,958.08 = 55,373.81 : x
  2. Step 2: Convert to fraction form
    100,687.85/138,958.08 = 55,373.81/x
  3. Step 3: Cross multiply
    100,687.85x = 138,958.08 × 55,373.81
  4. Step 4: Simplify right side
    100,687.85x = 7,694,637,625.09
  5. Step 5: Solve for x
    x = 7,694,637,625.09/100,687.85
  6. Step 6: Final answer
    x = 76,420.72

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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.