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Finding the Fourth Proportional to 78,879.52, 118,042.80 and 61,236.64

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Solution

The fourth proportional to 78,879.52, 118,042.80 and 61,236.64 is: 91,640.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,879.52 : 118,042.80 = 61,236.64 : x
  2. Step 2: Convert to fraction form
    78,879.52/118,042.80 = 61,236.64/x
  3. Step 3: Cross multiply
    78,879.52x = 118,042.80 × 61,236.64
  4. Step 4: Simplify right side
    78,879.52x = 7,228,544,448.19
  5. Step 5: Solve for x
    x = 7,228,544,448.19/78,879.52
  6. Step 6: Final answer
    x = 91,640.32

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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.