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Finding the Fourth Proportional to 13,728, 20,587.95 and 4,367.64

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Solution

The fourth proportional to 13,728, 20,587.95 and 4,367.64 is: 6,550.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728 : 20,587.95 = 4,367.64 : x
  2. Step 2: Convert to fraction form
    13,728/20,587.95 = 4,367.64/x
  3. Step 3: Cross multiply
    13,728x = 20,587.95 × 4,367.64
  4. Step 4: Simplify right side
    13,728x = 89,920,753.94
  5. Step 5: Solve for x
    x = 89,920,753.94/13,728
  6. Step 6: Final answer
    x = 6,550.17

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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.