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Finding the Fourth Proportional to 30,939.12, 42,696.02 and 16,791.98

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Solution

The fourth proportional to 30,939.12, 42,696.02 and 16,791.98 is: 23,172.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.12 : 42,696.02 = 16,791.98 : x
  2. Step 2: Convert to fraction form
    30,939.12/42,696.02 = 16,791.98/x
  3. Step 3: Cross multiply
    30,939.12x = 42,696.02 × 16,791.98
  4. Step 4: Simplify right side
    30,939.12x = 716,950,416.48
  5. Step 5: Solve for x
    x = 716,950,416.48/30,939.12
  6. Step 6: Final answer
    x = 23,172.94

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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.