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Finding the Fourth Proportional to 13,991.11, 19,308.16 and 7,618.12

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Solution

The fourth proportional to 13,991.11, 19,308.16 and 7,618.12 is: 10,513.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.11 : 19,308.16 = 7,618.12 : x
  2. Step 2: Convert to fraction form
    13,991.11/19,308.16 = 7,618.12/x
  3. Step 3: Cross multiply
    13,991.11x = 19,308.16 × 7,618.12
  4. Step 4: Simplify right side
    13,991.11x = 147,091,879.86
  5. Step 5: Solve for x
    x = 147,091,879.86/13,991.11
  6. Step 6: Final answer
    x = 10,513.24

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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.