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Finding the Fourth Proportional to 11,365.11, 15,685.11 and 6,889.05

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Solution

The fourth proportional to 11,365.11, 15,685.11 and 6,889.05 is: 9,507.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,365.11 : 15,685.11 = 6,889.05 : x
  2. Step 2: Convert to fraction form
    11,365.11/15,685.11 = 6,889.05/x
  3. Step 3: Cross multiply
    11,365.11x = 15,685.11 × 6,889.05
  4. Step 4: Simplify right side
    11,365.11x = 108,055,507.05
  5. Step 5: Solve for x
    x = 108,055,507.05/11,365.11
  6. Step 6: Final answer
    x = 9,507.65

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Half scale
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Double scale
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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.