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Finding the Fourth Proportional to 12,816, 17,688 and 7,850.88

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Solution

The fourth proportional to 12,816, 17,688 and 7,850.88 is: 10,835.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,816 : 17,688 = 7,850.88 : x
  2. Step 2: Convert to fraction form
    12,816/17,688 = 7,850.88/x
  3. Step 3: Cross multiply
    12,816x = 17,688 × 7,850.88
  4. Step 4: Simplify right side
    12,816x = 138,866,365.44
  5. Step 5: Solve for x
    x = 138,866,365.44/12,816
  6. Step 6: Final answer
    x = 10,835.39

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1.5x scale

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.