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Finding the Fourth Proportional to 13,311, 18,371.61 and 9,338.22

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Solution

The fourth proportional to 13,311, 18,371.61 and 9,338.22 is: 12,888.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,311 : 18,371.61 = 9,338.22 : x
  2. Step 2: Convert to fraction form
    13,311/18,371.61 = 9,338.22/x
  3. Step 3: Cross multiply
    13,311x = 18,371.61 × 9,338.22
  4. Step 4: Simplify right side
    13,311x = 171,558,135.93
  5. Step 5: Solve for x
    x = 171,558,135.93/13,311
  6. Step 6: Final answer
    x = 12,888.45

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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.