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Finding the Fourth Proportional to 39,654, 54,722.52 and 21,990

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Solution

The fourth proportional to 39,654, 54,722.52 and 21,990 is: 30,346.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,654 : 54,722.52 = 21,990 : x
  2. Step 2: Convert to fraction form
    39,654/54,722.52 = 21,990/x
  3. Step 3: Cross multiply
    39,654x = 54,722.52 × 21,990
  4. Step 4: Simplify right side
    39,654x = 1,203,348,214.80
  5. Step 5: Solve for x
    x = 1,203,348,214.80/39,654
  6. Step 6: Final answer
    x = 30,346.20

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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.