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Finding the Fourth Proportional to 128,605.68, 192,927.31 and 61,991.03

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Solution

The fourth proportional to 128,605.68, 192,927.31 and 61,991.03 is: 92,995.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.68 : 192,927.31 = 61,991.03 : x
  2. Step 2: Convert to fraction form
    128,605.68/192,927.31 = 61,991.03/x
  3. Step 3: Cross multiply
    128,605.68x = 192,927.31 × 61,991.03
  4. Step 4: Simplify right side
    128,605.68x = 11,959,762,662.03
  5. Step 5: Solve for x
    x = 11,959,762,662.03/128,605.68
  6. Step 6: Final answer
    x = 92,995.60

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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.