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Finding the Fourth Proportional to 15,880.72, 21,914.66 and 8,807

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Solution

The fourth proportional to 15,880.72, 21,914.66 and 8,807 is: 12,153.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,880.72 : 21,914.66 = 8,807 : x
  2. Step 2: Convert to fraction form
    15,880.72/21,914.66 = 8,807/x
  3. Step 3: Cross multiply
    15,880.72x = 21,914.66 × 8,807
  4. Step 4: Simplify right side
    15,880.72x = 193,002,410.62
  5. Step 5: Solve for x
    x = 193,002,410.62/15,880.72
  6. Step 6: Final answer
    x = 12,153.25

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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.