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Finding the Fourth Proportional to 65,846.40, 90,869.31 and 38,979.11

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Solution

The fourth proportional to 65,846.40, 90,869.31 and 38,979.11 is: 53,791.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,846.40 : 90,869.31 = 38,979.11 : x
  2. Step 2: Convert to fraction form
    65,846.40/90,869.31 = 38,979.11/x
  3. Step 3: Cross multiply
    65,846.40x = 90,869.31 × 38,979.11
  4. Step 4: Simplify right side
    65,846.40x = 3,542,004,375.77
  5. Step 5: Solve for x
    x = 3,542,004,375.77/65,846.40
  6. Step 6: Final answer
    x = 53,791.92

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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.