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Finding the Fourth Proportional to 39,693.71, 54,777.11 and 21,789.02

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Solution

The fourth proportional to 39,693.71, 54,777.11 and 21,789.02 is: 30,068.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,693.71 : 54,777.11 = 21,789.02 : x
  2. Step 2: Convert to fraction form
    39,693.71/54,777.11 = 21,789.02/x
  3. Step 3: Cross multiply
    39,693.71x = 54,777.11 × 21,789.02
  4. Step 4: Simplify right side
    39,693.71x = 1,193,539,162.50
  5. Step 5: Solve for x
    x = 1,193,539,162.50/39,693.71
  6. Step 6: Final answer
    x = 30,068.73

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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.