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Finding the Fourth Proportional to 13,415.68, 18,513.36 and 7,447

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Solution

The fourth proportional to 13,415.68, 18,513.36 and 7,447 is: 10,276.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.68 : 18,513.36 = 7,447 : x
  2. Step 2: Convert to fraction form
    13,415.68/18,513.36 = 7,447/x
  3. Step 3: Cross multiply
    13,415.68x = 18,513.36 × 7,447
  4. Step 4: Simplify right side
    13,415.68x = 137,868,991.92
  5. Step 5: Solve for x
    x = 137,868,991.92/13,415.68
  6. Step 6: Final answer
    x = 10,276.71

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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.