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Finding the Fourth Proportional to 118,879.60, 178,221.12 and 92,700.40

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Solution

The fourth proportional to 118,879.60, 178,221.12 and 92,700.40 is: 138,973.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,879.60 : 178,221.12 = 92,700.40 : x
  2. Step 2: Convert to fraction form
    118,879.60/178,221.12 = 92,700.40/x
  3. Step 3: Cross multiply
    118,879.60x = 178,221.12 × 92,700.40
  4. Step 4: Simplify right side
    118,879.60x = 16,521,169,112.45
  5. Step 5: Solve for x
    x = 16,521,169,112.45/118,879.60
  6. Step 6: Final answer
    x = 138,973.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.