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Finding the Fourth Proportional to 21,984.47, 30,340.05 and 12,421.04

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Solution

The fourth proportional to 21,984.47, 30,340.05 and 12,421.04 is: 17,141.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,984.47 : 30,340.05 = 12,421.04 : x
  2. Step 2: Convert to fraction form
    21,984.47/30,340.05 = 12,421.04/x
  3. Step 3: Cross multiply
    21,984.47x = 30,340.05 × 12,421.04
  4. Step 4: Simplify right side
    21,984.47x = 376,854,974.65
  5. Step 5: Solve for x
    x = 376,854,974.65/21,984.47
  6. Step 6: Final answer
    x = 17,141.87

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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.