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Finding the Fourth Proportional to 39,921, 59,879.88 and 11,839.92

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Solution

The fourth proportional to 39,921, 59,879.88 and 11,839.92 is: 17,759.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,921 : 59,879.88 = 11,839.92 : x
  2. Step 2: Convert to fraction form
    39,921/59,879.88 = 11,839.92/x
  3. Step 3: Cross multiply
    39,921x = 59,879.88 × 11,839.92
  4. Step 4: Simplify right side
    39,921x = 708,972,988.81
  5. Step 5: Solve for x
    x = 708,972,988.81/39,921
  6. Step 6: Final answer
    x = 17,759.40

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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.