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Finding the Fourth Proportional to 39,870.33, 55,018.99 and 21,964.94

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Solution

The fourth proportional to 39,870.33, 55,018.99 and 21,964.94 is: 30,310.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,870.33 : 55,018.99 = 21,964.94 : x
  2. Step 2: Convert to fraction form
    39,870.33/55,018.99 = 21,964.94/x
  3. Step 3: Cross multiply
    39,870.33x = 55,018.99 × 21,964.94
  4. Step 4: Simplify right side
    39,870.33x = 1,208,488,814.21
  5. Step 5: Solve for x
    x = 1,208,488,814.21/39,870.33
  6. Step 6: Final answer
    x = 30,310.48

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.