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Finding the Fourth Proportional to 13,612.51, 18,787.35 and 8,310.43

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Solution

The fourth proportional to 13,612.51, 18,787.35 and 8,310.43 is: 11,469.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,612.51 : 18,787.35 = 8,310.43 : x
  2. Step 2: Convert to fraction form
    13,612.51/18,787.35 = 8,310.43/x
  3. Step 3: Cross multiply
    13,612.51x = 18,787.35 × 8,310.43
  4. Step 4: Simplify right side
    13,612.51x = 156,130,957.06
  5. Step 5: Solve for x
    x = 156,130,957.06/13,612.51
  6. Step 6: Final answer
    x = 11,469.67

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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.