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Finding the Fourth Proportional to 18,787.74, 28,181.88 and 8,928

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Solution

The fourth proportional to 18,787.74, 28,181.88 and 8,928 is: 13,392.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,787.74 : 28,181.88 = 8,928 : x
  2. Step 2: Convert to fraction form
    18,787.74/28,181.88 = 8,928/x
  3. Step 3: Cross multiply
    18,787.74x = 28,181.88 × 8,928
  4. Step 4: Simplify right side
    18,787.74x = 251,607,824.64
  5. Step 5: Solve for x
    x = 251,607,824.64/18,787.74
  6. Step 6: Final answer
    x = 13,392.13

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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.