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Finding the Fourth Proportional to 21,644.64, 29,870.44 and 12,213

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Solution

The fourth proportional to 21,644.64, 29,870.44 and 12,213 is: 16,854.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,644.64 : 29,870.44 = 12,213 : x
  2. Step 2: Convert to fraction form
    21,644.64/29,870.44 = 12,213/x
  3. Step 3: Cross multiply
    21,644.64x = 29,870.44 × 12,213
  4. Step 4: Simplify right side
    21,644.64x = 364,807,653.19
  5. Step 5: Solve for x
    x = 364,807,653.19/21,644.64
  6. Step 6: Final answer
    x = 16,854.41

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Why These Related Problems?

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