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Finding the Fourth Proportional to 39,361, 54,318.20 and 21,697

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Solution

The fourth proportional to 39,361, 54,318.20 and 21,697 is: 29,941.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,361 : 54,318.20 = 21,697 : x
  2. Step 2: Convert to fraction form
    39,361/54,318.20 = 21,697/x
  3. Step 3: Cross multiply
    39,361x = 54,318.20 × 21,697
  4. Step 4: Simplify right side
    39,361x = 1,178,541,985.40
  5. Step 5: Solve for x
    x = 1,178,541,985.40/39,361
  6. Step 6: Final answer
    x = 29,941.87

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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.