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Finding the Fourth Proportional to 39,894.89, 55,054.67 and 21,989.91

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Solution

The fourth proportional to 39,894.89, 55,054.67 and 21,989.91 is: 30,345.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,894.89 : 55,054.67 = 21,989.91 : x
  2. Step 2: Convert to fraction form
    39,894.89/55,054.67 = 21,989.91/x
  3. Step 3: Cross multiply
    39,894.89x = 55,054.67 × 21,989.91
  4. Step 4: Simplify right side
    39,894.89x = 1,210,647,238.38
  5. Step 5: Solve for x
    x = 1,210,647,238.38/39,894.89
  6. Step 6: Final answer
    x = 30,345.92

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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.