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Finding the Fourth Proportional to 65,907.81, 90,947.07 and 39,045.78

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Solution

The fourth proportional to 65,907.81, 90,947.07 and 39,045.78 is: 53,879.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,907.81 : 90,947.07 = 39,045.78 : x
  2. Step 2: Convert to fraction form
    65,907.81/90,947.07 = 39,045.78/x
  3. Step 3: Cross multiply
    65,907.81x = 90,947.07 × 39,045.78
  4. Step 4: Simplify right side
    65,907.81x = 3,551,099,286.86
  5. Step 5: Solve for x
    x = 3,551,099,286.86/65,907.81
  6. Step 6: Final answer
    x = 53,879.79

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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.