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Finding the Fourth Proportional to 21,120.88, 29,147.52 and 12,622.72

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Solution

The fourth proportional to 21,120.88, 29,147.52 and 12,622.72 is: 17,419.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.88 : 29,147.52 = 12,622.72 : x
  2. Step 2: Convert to fraction form
    21,120.88/29,147.52 = 12,622.72/x
  3. Step 3: Cross multiply
    21,120.88x = 29,147.52 × 12,622.72
  4. Step 4: Simplify right side
    21,120.88x = 367,920,983.65
  5. Step 5: Solve for x
    x = 367,920,983.65/21,120.88
  6. Step 6: Final answer
    x = 17,419.78

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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.