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Finding the Fourth Proportional to 21,028.52, 31,540.08 and 9,787.88

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Solution

The fourth proportional to 21,028.52, 31,540.08 and 9,787.88 is: 14,680.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,028.52 : 31,540.08 = 9,787.88 : x
  2. Step 2: Convert to fraction form
    21,028.52/31,540.08 = 9,787.88/x
  3. Step 3: Cross multiply
    21,028.52x = 31,540.08 × 9,787.88
  4. Step 4: Simplify right side
    21,028.52x = 308,710,518.23
  5. Step 5: Solve for x
    x = 308,710,518.23/21,028.52
  6. Step 6: Final answer
    x = 14,680.56

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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.