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Finding the Fourth Proportional to 18,581.64, 27,880.64 and 8,720.08

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Solution

The fourth proportional to 18,581.64, 27,880.64 and 8,720.08 is: 13,083.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,581.64 : 27,880.64 = 8,720.08 : x
  2. Step 2: Convert to fraction form
    18,581.64/27,880.64 = 8,720.08/x
  3. Step 3: Cross multiply
    18,581.64x = 27,880.64 × 8,720.08
  4. Step 4: Simplify right side
    18,581.64x = 243,121,411.25
  5. Step 5: Solve for x
    x = 243,121,411.25/18,581.64
  6. Step 6: Final answer
    x = 13,083.96

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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.