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Finding the Fourth Proportional to 13,415.73, 18,513.87 and 7,447.95

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Solution

The fourth proportional to 13,415.73, 18,513.87 and 7,447.95 is: 10,278.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.73 : 18,513.87 = 7,447.95 : x
  2. Step 2: Convert to fraction form
    13,415.73/18,513.87 = 7,447.95/x
  3. Step 3: Cross multiply
    13,415.73x = 18,513.87 × 7,447.95
  4. Step 4: Simplify right side
    13,415.73x = 137,890,350.14
  5. Step 5: Solve for x
    x = 137,890,350.14/13,415.73
  6. Step 6: Final answer
    x = 10,278.26

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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.