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Finding the Fourth Proportional to 39,775.30, 54,890.04 and 21,871.42

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Solution

The fourth proportional to 39,775.30, 54,890.04 and 21,871.42 is: 30,182.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,775.30 : 54,890.04 = 21,871.42 : x
  2. Step 2: Convert to fraction form
    39,775.30/54,890.04 = 21,871.42/x
  3. Step 3: Cross multiply
    39,775.30x = 54,890.04 × 21,871.42
  4. Step 4: Simplify right side
    39,775.30x = 1,200,523,118.66
  5. Step 5: Solve for x
    x = 1,200,523,118.66/39,775.30
  6. Step 6: Final answer
    x = 30,182.63

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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.