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Finding the Fourth Proportional to 39,859.64, 55,008.79 and 21,954.64

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Solution

The fourth proportional to 39,859.64, 55,008.79 and 21,954.64 is: 30,298.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,859.64 : 55,008.79 = 21,954.64 : x
  2. Step 2: Convert to fraction form
    39,859.64/55,008.79 = 21,954.64/x
  3. Step 3: Cross multiply
    39,859.64x = 55,008.79 × 21,954.64
  4. Step 4: Simplify right side
    39,859.64x = 1,207,698,181.29
  5. Step 5: Solve for x
    x = 1,207,698,181.29/39,859.64
  6. Step 6: Final answer
    x = 30,298.77

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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.