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Finding the Fourth Proportional to 103,990.68, 155,871.81 and 40,791.78

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Solution

The fourth proportional to 103,990.68, 155,871.81 and 40,791.78 is: 61,142.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,990.68 : 155,871.81 = 40,791.78 : x
  2. Step 2: Convert to fraction form
    103,990.68/155,871.81 = 40,791.78/x
  3. Step 3: Cross multiply
    103,990.68x = 155,871.81 × 40,791.78
  4. Step 4: Simplify right side
    103,990.68x = 6,358,288,581.72
  5. Step 5: Solve for x
    x = 6,358,288,581.72/103,990.68
  6. Step 6: Final answer
    x = 61,142.87

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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.