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Finding the Fourth Proportional to 19,791.63, 29,693.52 and 6,642.90

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Solution

The fourth proportional to 19,791.63, 29,693.52 and 6,642.90 is: 9,966.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,791.63 : 29,693.52 = 6,642.90 : x
  2. Step 2: Convert to fraction form
    19,791.63/29,693.52 = 6,642.90/x
  3. Step 3: Cross multiply
    19,791.63x = 29,693.52 × 6,642.90
  4. Step 4: Simplify right side
    19,791.63x = 197,251,084.01
  5. Step 5: Solve for x
    x = 197,251,084.01/19,791.63
  6. Step 6: Final answer
    x = 9,966.39

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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.