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Finding the Fourth Proportional to 118,686.60, 163,863.91 and 105,917.86

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Solution

The fourth proportional to 118,686.60, 163,863.91 and 105,917.86 is: 146,234.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,686.60 : 163,863.91 = 105,917.86 : x
  2. Step 2: Convert to fraction form
    118,686.60/163,863.91 = 105,917.86/x
  3. Step 3: Cross multiply
    118,686.60x = 163,863.91 × 105,917.86
  4. Step 4: Simplify right side
    118,686.60x = 17,356,115,015.66
  5. Step 5: Solve for x
    x = 17,356,115,015.66/118,686.60
  6. Step 6: Final answer
    x = 146,234.83

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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.