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Finding the Fourth Proportional to 39,864, 55,014.81 and 21,959.01

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Solution

The fourth proportional to 39,864, 55,014.81 and 21,959.01 is: 30,304.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,864 : 55,014.81 = 21,959.01 : x
  2. Step 2: Convert to fraction form
    39,864/55,014.81 = 21,959.01/x
  3. Step 3: Cross multiply
    39,864x = 55,014.81 × 21,959.01
  4. Step 4: Simplify right side
    39,864x = 1,208,070,762.94
  5. Step 5: Solve for x
    x = 1,208,070,762.94/39,864
  6. Step 6: Final answer
    x = 30,304.81

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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.