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Finding the Fourth Proportional to 85,978.39, 118,650.65 and 47,738.53

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Solution

The fourth proportional to 85,978.39, 118,650.65 and 47,738.53 is: 65,879.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.39 : 118,650.65 = 47,738.53 : x
  2. Step 2: Convert to fraction form
    85,978.39/118,650.65 = 47,738.53/x
  3. Step 3: Cross multiply
    85,978.39x = 118,650.65 × 47,738.53
  4. Step 4: Simplify right side
    85,978.39x = 5,664,207,614.54
  5. Step 5: Solve for x
    x = 5,664,207,614.54/85,978.39
  6. Step 6: Final answer
    x = 65,879.43

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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.