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Finding the Fourth Proportional to 28,648.36, 42,989.22 and 12,007

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Solution

The fourth proportional to 28,648.36, 42,989.22 and 12,007 is: 18,017.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,648.36 : 42,989.22 = 12,007 : x
  2. Step 2: Convert to fraction form
    28,648.36/42,989.22 = 12,007/x
  3. Step 3: Cross multiply
    28,648.36x = 42,989.22 × 12,007
  4. Step 4: Simplify right side
    28,648.36x = 516,171,564.54
  5. Step 5: Solve for x
    x = 516,171,564.54/28,648.36
  6. Step 6: Final answer
    x = 18,017.49

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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.