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Finding the Fourth Proportional to 18,661.66, 28,001.43 and 11,639.87

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Solution

The fourth proportional to 18,661.66, 28,001.43 and 11,639.87 is: 17,465.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661.66 : 28,001.43 = 11,639.87 : x
  2. Step 2: Convert to fraction form
    18,661.66/28,001.43 = 11,639.87/x
  3. Step 3: Cross multiply
    18,661.66x = 28,001.43 × 11,639.87
  4. Step 4: Simplify right side
    18,661.66x = 325,932,865.01
  5. Step 5: Solve for x
    x = 325,932,865.01/18,661.66
  6. Step 6: Final answer
    x = 17,465.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.