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Finding the Fourth Proportional to 21,276.88, 31,929.89 and 7,425.88

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Solution

The fourth proportional to 21,276.88, 31,929.89 and 7,425.88 is: 11,143.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,276.88 : 31,929.89 = 7,425.88 : x
  2. Step 2: Convert to fraction form
    21,276.88/31,929.89 = 7,425.88/x
  3. Step 3: Cross multiply
    21,276.88x = 31,929.89 × 7,425.88
  4. Step 4: Simplify right side
    21,276.88x = 237,107,531.55
  5. Step 5: Solve for x
    x = 237,107,531.55/21,276.88
  6. Step 6: Final answer
    x = 11,143.91

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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.