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Finding the Fourth Proportional to 19,991.41, 29,986.98 and 6,665.42

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Solution

The fourth proportional to 19,991.41, 29,986.98 and 6,665.42 is: 9,998.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.41 : 29,986.98 = 6,665.42 : x
  2. Step 2: Convert to fraction form
    19,991.41/29,986.98 = 6,665.42/x
  3. Step 3: Cross multiply
    19,991.41x = 29,986.98 × 6,665.42
  4. Step 4: Simplify right side
    19,991.41x = 199,875,866.20
  5. Step 5: Solve for x
    x = 199,875,866.20/19,991.41
  6. Step 6: Final answer
    x = 9,998.09

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1.5x scale

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.